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Studies on the T and O group specific substances in human fetus. I. The T and O group specific substances in human meconium with particular emphasis on fetal age in months



Studies on the T and O group specific substances in human fetus. I. The T and O group specific substances in human meconium with particular emphasis on fetal age in months



Nagasaki Med Jour 34(8): 1070-1084



Human meconium was studied during the stages between 5 to 10 months of gestation and the quantitative changes of T and O group specific sub-stances compared in relation to monthly increase in fetal age. Many studies on precipitation of domestic fowl anti- T and anti-O serum by human meconium show a positive reaction with both anti-T and anti-O, but precipitation with anti-O serum gives a stronger positive reaction and higher antigen titer than anti-T serum, except in the instance of non-secretor of human meconium. Meconium of 9 and 10 month fetuses showed 100% positive reaction in precipitation with anti-T serum. In precipitation with anti-O serum, meconium showed 100% positive reaction as early as 5 months of age, but the antigen titer continued to rise with increase in age. The absorption of anti-T precipitins by human meconium increased with monthly age and this tendency was the same in the case of anti-O precipitins. In each month of gestation the absorption of anti-T substance by human meconium was inferior to the absorption of anti-O precipitins. Human meconium could generally be devided into types which have a very high amount and a low amount of inhibiting titer (type specific agglutination inhibition reaction) to anti-A human serum, anti-B human serum and anti-O agglutinin, but a few instances of middle types were also found. It was found that in general a parallel reaction existed between the type specific agglutination inhibition reaction and the absorptivity (with anti-T, anti-O) and precipitation (with anti-T, anti-O) of human meconium.

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