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Distribution of PAF acetylhydrolase activity according to genotype. Plasma samples from control subjects and from asthmatic patients were assayed for PAF acetylhydrolase activity as described previously (29). The genotype at the 279 locus was determined by an allele–specific PCR assay (24), and the subjects were categorized according to genotype. The values reported are the average of two determinations that agreed within 10% of each other.
