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(2) research involving recombinant DXA may 
involve a high risk not only to those pursuing such 
research but to the population in general ; 
(3) it is essential in the public interest that the 
health and welfare of the Xation be protected by requir- 
ing that all research conducted with regard to recom- 
binant DXA comply with strict standards of performance 
and safety ; and 
(4) all research with regard to recombinant DXA 
is either in interstate connnerce or substantially affects 
such commerce and regulations by the Secretary of 
Health, Education, and Welfare as contemplated by this 
Act are necessary and proper to prevent and eliminate 
burdens on interstate commerce, to regulate such com- 
merce effectively, and to protect the health and welfare 
of the Xation. 
DEFINITION'S 
Sec. 3. As used in this Act the term — 
( 1 ) “recombinant DXA” means molecules that con- 
sist of different segments of deoxyribonucleic acid which 
have been joined together in cell-free systems to infect 
and replicate in some host cell, either autonomously or on 
an integrated part of the host’s genome ; 
(2) “Secretary” means the Secretary of Health, 
Education, and Welfare ; 
(3) “commerce” means — 
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