the absence of 4000-dalton pross-ntp species in 24-h culture medium , the lack of degradation of 4000-dalton pross-ntp ( recovered from ca77 cell extracts ) added to tissue culture medium , and the selective secretion of the 8000-dalton pross-ntp species under both basal and stimulated conditions coordinate with the secretion of ss indicate that the 4000-dalton pross-ntp-containing species is not secreted .
C0007634
cell
C1327616
secreted