The discrimination of phenotypes for rate of disappearance of isonicotinoyl hydrazide from serum
1969
A B S T R A C T Expression of the rate of inactivation of isonicotinoyl hydrazide (INH) as a first-order constant gave better discrimination of slow and rapid inactivators than did the level of INH at the end of 6 hr. The most probable division point between the two classes was at k =0.130. Rate of inactivation by obligatory heterozygotes was determined. Such heterozygotes could not be adequately differentiated from homozygous rapid inactivators. The gene frequency for slow inactivation was 0.46 +0.04 in Alaskan Eskimos and 0.62 +0.06 in Athabaskan Indians.
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