[Determination of the C3 component in relation to paternity suits].

The C3 component which is a part of the complement appears to be of significance in assessing fatherhood in paternity causes. Its occurrence follow hereditary laws, in homozygotes the phenotype is represented by one, in heterozypotes by two zones designated as S, F and SF. The demonstration depends on the quality of the serum and the laboratory technique used. The same applies to the reliability of the readings.