.... At present, five different families of isoenzymes of PDE exist that show a distinct species-specific and organ-specific distribution. The aim of the present study was to analyze the PDE isoenzymes present in the human ureter and to evaluate the functional effects of isoenzyme-specific inhibitors...

... in prostasomes although a fairly large amount of enzyme activity seemed to be free in solution. Isoenzymes LD 1 , LD 2 and LD 3 , present in prostasomes in about equal amounts, gave rise to a characteristic isoenzyme pattern that differed distinctly from that found in seminal plasma of normozoospermic men...