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Studies on the T and O group specific substances in human amniotic fluid



Studies on the T and O group specific substances in human amniotic fluid



Nagasaki Med Jour 34(8): 1186-1205



Studies on T and O group specific substances of human amniotic fluid in every month of pregnancy were attempted to test agglutination inhibition, precipitin absorption and precipitation reactions. T group specific substances in human amniotic fluid were detectable on and after the 7th month of pregnancy in the precipitin absorption test and on the 8th month or over in the precipitation test. O group specific substances were found in 4th month of pregnancy in both precipitin absorption and precipitation tests and subsequently were analyzed quantitatively. In the precipitation test, the highest titers of T and O substances in amniotic fluid were estimated at ranging from 20x to 40x, but were weaker when compared with the titers (80x-160x) of the saliva of the mother. Furthermore, the highest titer in the agglutination inhibition test of amniotic fluid was also weaker than that (1024x-2048x) of blood specific substances (A, B, O) in saliva. The titer in the agglutination inhibition test was not always related to the month of pregnancy. The type of the amniotic fluid did not always coincide with the blood type of the mother. In amniotic fluid 2 types, acting as secretory or nonsecretory forms, were found in the agglutination-inhibition test. On and after the 7th month of pregnancy the amniotic fluids which acts as nonsecretory types were capable of absorbing anti-T precipitin and those of 9th month or later were in all cases positive by the anti-T precipitin test. Amniotic fluid which was positive in both anti-T precipitation and anti-O precipitation tests was in all cases absorbable in the absorption test. The high titer antigen was stronger in absorbent potency than the low one. In such amniotic fluid, the agglutination inhibition titer was weak if anti-T precipitation reaction was strong and was high if anti-O precipitation reaction was strong. There were a few cases where this was not true. Moreover, the former exhibited the reaction of nonsecretory type and the latter that of secretory type.

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