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other activities may be of great benefit to medicine and 
agriculture and may provide many other benefits to 
society ; 
(3) there exist, however, uncertainties regarding 
the extent to which recombinant DXA or organisms or 
viruses containing recombinant DXA and activities in- 
volving recombinant DXA may present « risk of injury 
to human health or the environment, and there is a risk 
that such organisms and viruses may spread quickly and 
without warning to persons, agricultural plants and 
products, and other items in or affecting commerce; 
(4) the public interest requires that the health and 
welfare of the population of the United States be pro- 
tected from such risk, and commerce in the United States 
is dependent upon such protection being provided; and 
(5) to effectively accomplish such protection and 
consequently to effectively regulate commerce requires 
that the possession of recombinant DXA and any 
activity engaged in for its production (whether a re- 
search or commercial activity) be subject to control. 
AMENDMENT TO TIIE TUBLIC HEALTH SERVICE ACT 
Sec. 3. Title IV of the Public Health Service Act is 
amended (1) by redesignating part I as part J, (2) by re- 
designating sections 471 through 47G (and all references to 
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