although no interferon ( ifn ) activity was detectable in the hela s3 cell-conditioned culture medium after growth stimulation , addition of anti-ifn-beta monoclonal antibody inhibited both the expression of the 2-5a synthetase gene and the production of the enzyme , suggesting that endogenous ifn-beta was involved in 2-5a synthetase induction .
C1334397
synthetase gene
C0023689
synthetase