proteolytic activity was measured in the follicle wall surrounding oocytes from brook trout ( salvelinus fontinalis ) and yellow perch ( perca flavescens ) by use of two different protease assays : sodium dodecyl sulfate-polyacrylamide gel electrophoresis ( substrate-sds-page ) and a chromogenic synthetic peptide for type i collagen .
C0018120
follicle
C0029045
oocytes