[Inhibition of PZ-peptidases by serum (author's transl)].

The inhibition of two PZ-peptidases by several sera was studied with the aid of methods based on the PZ-peptidase assay of Wünsch and Heidrich Clostridiopeptidase A is inhibited by all sera, whilst the PZ-peptidase from the rabbit serum is inhibited only by heterologous sera. The inhibition is weak and cannot be compared with the strong serum inhibition shown by collagenases.