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* personnel access opening An opening in a vessel or sewer to permit human entry. Also called a “manhole” or “manway.” ...imary standards National ambient air quality standards designed to protect human health with an adequate margin for safety.

...Y, Nickle DC, Shriner D, et al. (2004). "Molecular clock-like evolution of human immunodeficiency virus type 1". ''Virology''. 10;329(1):101–8, PMID 15476 |title=Did the first virus self-assemble from self-replicating prion proteins and RNA?