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ity under this title, the Secretary, the Commission, or any per- 
son acting on behalf of the Secretary or Commission or pur- 
suant to the provisions of this title, shall not, for the purposes 
of section 4(b)(1) of the Occupational Safety and Health Act 
of 1970, be deemed to be exercising statutory authority to 
prescribe or enforce standards or regulations affecting occu- 
pational safety and health." . 
“ DEFINITIONS 
“Sec. 1821. ( a) For purposes of this part: 
“(1) ‘DNA’ means deoxyribonucleic acid. 
“(2) (A) 'Recombinant DNA’ means DNA molecules 
that consist of different segments of DNA which have been 
joined together outside any cell, and have the potential 
for entering and propagating in a particular host cell, either 
autonomously or as an integrated part of the host celVs 
genome. 
“(B) Except as provided in subparagraph (C), the 
Commission shall, upon its finding and after final publica- 
tion of such finding in the Federal Register, exempt from 
the definition in subparagraph (A) DNA molecules com- 
posed only of DNA segments from the following sources: the 
host species, a related species which is known to exchange 
genetic information in nature with the host cell, and/or a 
natural parasite or plasmid of the host cell; such composite 
[ 734 ] 
