ILLUSTRATION: ILARIA URBINATI
118 Can prophylactic drugs keep
fragile health systems running?
A raft of trials will test whether chloroquine
and other treatments can protect health
workers from COVID-19 By K. Kupferschmidt119 NAS letter suggests ‘normal
breathing’ can expel coronavirus
But some experts are skeptical
that small respiratory particles
transmit infectious virus
By R. F. Service120 European Union gets in the
venture capital game
Flush with cash, new EU innovation
agency buys shares in disruptive
technology startups By N. WallaceNEWS
IN BRIEF
114 News at a glanceIN DEPTH
116 Pandemic brings mass
vaccinations to a halt
Polio, measles, other diseases set to
surge as COVID-19 forces suspension
of campaigns By L. Roberts117 Tested by HIV and TB, South Africa
confronts new pandemic
Infrastructure and tactics developed for
existing epidemics could aid the coronavirus
fight By L. NordlingSCIENCE sciencemag.org 10 APRIL 2020 • VOL 368 ISSUE 6487 10510 APRIL 2020 • VOLUME 368 • ISSUE 6487124
CONTENTS
INSIGHTS
PERSPECTIVES
128 Tree diversity reduced to the
bare essentials
Tropical forest dynamics can be explained by
merely two functional trait axes By H. Bugmann
REPORT p. 165129 The “iron will” of the gut
A gut-derived hormone controls iron
concentrations, microbiota composition,
and mucosal healing By M. Rescigno
REPORT p. 186131 The smallest particle collider
A new experiment finds direct evidence for
anyons in a semiconductor heterostructure
By D. E. Feldman
REPORT p. 173132 Autoimmunity provoked by foreign
antigens
In celiac disease, exogenous gluten drives
T cell–B cell interactions that cause
autoimmunity By R. Iversen and L. M. Sollid134 Epigenetic tinkering with
neurotransmitters
Some neurotransmitters modify
chromatin and modulate gene expression
By J.-A. Girault
REPORT p. 197135 Spin pumping gathers speed
Coherent spin pumping from an
antiferromagnet into a metal occurs at
~400 gigahertz By A. Hoffmann
RESEARCH ARTICLE p. 160136 Rafting on a wide and wild ocean
During the Oligocene, now-extinct monkeys
crossed the treacherous ocean from Africa to
South America By M. Godinot
REPORT p. 194121 United States aims to curb vaccination
injury payouts
Proposal would make it harder to get
compensated for shoulder injuries after
misplaced injections By M. Wadman122 Help for a wheat fungal disease comes
from a surprising source
Resistance gene found in wild grass originated
in a fungus By E. StokstadFEATURES
124 Rethinking anorexia
Challenging long-standing theories about the
eating disorder, new research suggests biology
is a powerful driver By J. Couzin-Frankel
PODCAST