other purine nucleosides , e.g. , guanosine , and several purine and ribosemodified structural analogues of adenosine also inhibited zymosan-stimulated beta-galactosidase secretion , while xanthosine and certain pyrimidine nucleosides , e.g. , thymidine , were inactive in this respect .
C0034136
purine nucleosides
C0001443
adenosine