Attadment I, I^ge 13 
roMln the first line of defense against occupational exposures.^ 
Biological contalnaent, resulting from use of attenuated or debilitated 
organlsas remains a second Important protection. There Is however, 
(^certainty as to the possible health consequences of employment In the 
Industries which are contemplating commercial application of rONA. Medical 
surveillance, with all of Its shortcomings, provides a means for addressing 
that uncertainty. 
[3911 
