ISSN 0036-807512 MAY 1995VOLUME 268NUMBER 5212

AMERICANASSOCIATION FORTHEADVANCEMENT OFSCIENCE

NEWS & COMMENT

Dispute Splits Schizophrenia StudyA Glimpse of an Elusive Quarry

O'Leary Takes Swipe at Bureaucracy

U.K. Tries to Set Priorities With theBenefit of Foresight

Russian Arctic Battles Pipeline Leak

Japan: Chiba's Heavy-Ion AcceleratorBattles Cancer and Critics

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RESEARCH NEWSnoMAAueA

New Clue to Prostate Cancer Spread 799

Battle Is Joined Over Gamma Bursts 800

Study Unveils Climate Cooling Caused 802by Pollutant Haze

Researchers Get a Sharper Image r 803of the Human Brain

Keeping the Kilo From Gaining Weight 804

Umbilical Cords: Turning Garbage IntoClinical Gold

New Compounds Make Light of Pests

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POLICY FORUM

The World's Forests: Need for aPolicy AppraisalN. Myers

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PERSPECTIVES--

Neuropeptides, Adenylyl Cyclase, and r 825Memory StorageE. Kandel and T. Abel

r 827A Fixation with FixationG. J. Leigh

ARTICLEFrom Microwave Anisotropies toCosmologyD. Scott, J. Silk, M. White

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DEPARTMENTSTHIS WEEK IN SCIENCE

EDITORIALDegrees of Uncertainty

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LETTERS 785Impetus for NSF Policy: D. N. Langenberg * WhoSurvived the Cretaceous?: D. H. Janzen * Author-ship Criteria: J. P. Kassirer * EPA and Biotechnol-ogy Regulation: L. R. Goldman * Reading Disabil-ity, Attention-Deficit Hyperactivity Disorder, andthe Immune System: R. P. Warren, J. D. Odell,W. L. Warren, R. A. Burger, A. Maciulis, W. W.Daniels, A. R. Torres; L. R. Cardon, S. D. Smith,

D. W. Fulker, W. J. Kimberling, B. F. Pennington,J. C. DeFries * Amorphous Stability and Trehalose:C. Colaco, J. Kampinga, B. Roser * NoncodingDNA, Zipf's Law, and Language: A. K. Konopkaand C. Martindale

SCIENCESCOPE

RANDOM SAMPLES

791

807

BOOK REVIEWS 905The Values of Precision, reviewed by S. Widmalm *Vignettes * Reprints of Books Previously Reviewed

PRODUCTS & MATERIALS 915

wnwm_ vab o arw~Board of Reviewing Editors ..inuwutiwinuuuuminuuinmuusm.&C. Thomas CaskeyDennis W. ChoiJohn M. CoffinF. Fleming CrimPaul J. CrutzenJames E. DahlbergRobert DesimoneBruce F. EldridgePaul T. EnglundRichard G. Fairbanks

Douglas T. FearonHarry A. FozzardKlaus FriedrichTheodore H. GeballeRoger 1. M. GlassStephen P. GoffPeter N. GoodfellowCorey S. GoodmanIra HerskowitzEric F. Johnson

Stephen M. KosslynMichael LaBarberaNicole Le DouarinCharles S. Levings Ill

Alexander LevitzkiHarvey F. LodishRichard LosickReinhard LihrmannDiane MathisAnthony R. Means

Shigetada NakanishiRoger A. NicollStuart L. PimmYeshayau PockerDennis A. PowersRalph S. QuatranoV. RamanathanDouglas C. ReesT. M. RiceDavid C. Rubie

Erkki RuoslahtiGottfried SchatzJozef SchellRonald H. SchwartzTerrence J. SejnowskiEllen SolomonThomas A. SteitzMichael P. StrykerRobert T. N. TjianEmil R. Unanue

Geerat J. VermeijBert VogelsteinArthur WeissZena WerbGeorge M. WhitesidesOwen N. WitteWilliam A. Wulf

SCIENCE * VOL. 268 * 12 MAY 1995

SCIENCE

803 & 889Functional visualization

Frederick W. AltDon L. AndersonMichael AshburnerStephen J. BenkovicDavid E. BloomPiet BorstHenry R. BourneMichael S. BrownJames J. BullKathryn Calame

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aCOVER

This skeleton of a Late Triassic turtle (210 million years along with those from Northern Hemisphere sites sug-ago) from Argentina extends the South American fossil gest that turtles were a taxonomically and ecologicallyrecord of turtles by 60 million years and provides the diverse group by the Late Triassic. The shell is 55basis for a new interpretation of basal turtle relation- centimeters long from front to back. See page 855.ships and the origin of living groups. This new taxon [Photo: G. W. Rougier]

RESEARCH ARTICLEConversion of Xenopus Ectoderm 836into Neurons by NeuroD, a BasicHelix-Loop-Helix Protein

J. E. Lee, S. M. Hollenberg, L. Snider, D. L.Turner, N. Lipnick, H. Weintraub

REPORTS --------Aligned Carbon Nanotube Films: 845Production and Optical and ElectronicPropertiesW. A. de Heer, W. S. Bacsa, A. Chatelain, T.Gerfin, R. Humphrey-Baker, L. Forro, D. Ugarte

Phonons Localized at Step Edges:A Route to Understanding Forces atExtended Surface DefectsL. Niu, D. J. Gaspar, S. J. Sibener

Seismic Evidence for an EarthquakeNucleation PhaseW. L. Ellsworth and G. C. Beroza

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851

Late Triassic Turtles from South America 855G. W. Rougier, M. S. de la Fuente, A. B. Arcucci

Serpentine Stability to Mantle Depthsand Subduction-Related MagmatismP. Ulmer and V. Trommsdorff

Dinitrogen Cleavage by aThree-Coordinate Molybdenum(III)ComplexC. E. Laplaza and C. C. Cummins

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F 861

CD1 Recognition by Mouse NK1+ T 863LymphocytesA. Bendelac, 0. Lantz, M. E. Quimby, J. W.Yewdell, J. R. Bennink, R. R. Brutkiewicz

Identification and Characterization of a 866Prostaglandin TransporterN. Kanai, R. Lu, J. A. Satriano, Y. Bao, A. W.Wolkoff, V. L. Schuster

A Neuropeptide Gene Defined by theDrosophila Memory Mutant amnesiacM. B. Feany and W. G. Quinn

0 869

Control of Proton Sensitivity of the 873NMDA Receptor by RNA Splicing andPolyaminesS. F. Traynelis, M. Hartley, S. F. Heinemann

Gene Trap Tagging of PROLIFERA, 877an Essential MCM2-3-5-Like Gene inArabidopsis

P. S. Springer, W. R. McCombie, V. Sundaresan,R. A. Martienssen

Role of the Chaperone Protein Hsp104 in 880Propagation of the Yeast Prion-LikeFactor [psi+]Y. O. Chemoff, S. L. Lindquist, B.-i. Ono,S. G. Inge-Vechtomov, S. W. Liebman

KAI1, a Metastasis Suppressor Gene r 884for Prostate Cancer on HumanChromosome lip1 1.2J.-T. Dong, P. W. Lamb, C. W. Rinker-Schaeffer, J. Vukanovic, T. Ichikawa, J. T.Isaacs, J. C. Barrett

Long-Range Motional Restrictions in aMultidomain Zinc-Finger Protein fromAnisotropic TumblingR. Brfischweiler, X. Liao, P. E. Wright

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Borders of Multiple Visual Areas in r 889Humans Revealed by Functional MagneticResonance ImagingM. I. Sereno, A. M. Dale, J. B. Reppas, K. K.Kwong, J. W. Belliveau, T. J. Brady, B. R.Rosen, R. B. H. Tootell

TECHNICAL COMMENTS I

Evaluating Turnover in Tropical ForestsD. Sheil; 0. Phillips

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SCIENCE * VOL. 268 * 12 MAY 1995

836Before and after neuroD

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