"External release of protease by stationary burrow-dwelling polychaetes" by Robert A. Zottoli and Melbourne R. Carriker
 

Abstract

1. Introduction Travis and Gonsalves (1969) and Carriker (1969) hypothesized that the accessory boring organ of such gastropods as Urosalpinx cinerea (Say) may secrete a protease, possibly a conchiolinase, during penetration of prey shell. They suggested that the enzyme initially may dissolve the non-mineralized organic matrix surrounding the calcareous units of shell, exposing the units to solution by acids, chelators, or both....

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