Abstract
There was a significant positive correlation between protein content and the amounts of trypsin and carboxypeptidase B (CPB) in the digestive portion of the midgut of G. morsitans morsitans, 24, 48, 72 and 96 h after feeding on a rabbit. CPB and trypsin activity were positively correlated. Trypsin and CPB production were stimulated to varying degrees by bovine serum albumin (BSA), .alpha.-globulin, .beta.-globulin, .gamma.-globulin and Hb; the greatest response was to BSA. Peptides derived from BSA by trypsin cleavage stimulated production of trypsin and CPB.