Abstract
A crude extract of the fat bodies of 3rd-instar larvae of S. peregrina (fleshfly) contained latent RNAase consisting of RNAase and inhibitor protein that is sensitive to p-chloromercuribenzoic acid. The RNAase activity in the crude extract of fat bodies became detectable with time after puparium formation, indicating that the inhibitor is selectively inactivated and RNAase is released from the RNAase-inhibitor complex during metamorphosis.