Table 2. Residual protease activity under different inhibitors.

Intestinal contents	No inhibitor (control)	Aprotinin (serine-protease inhibitor)	E64 (cysteine-protease inhibitor)	Pepstatin (aspartic-protease inhibitor)	EDTA (metalloprotease inhibitor)
Crop	100	45±4*	125±18	123±7	117±3*
Style sac	100	38±3*	99±5	108±5	106±4
Coiled gut	100	84±9	100±8	98±7	78±6

Percent inhibition (mean ± SEM) was calculated as residual protease activity in each group exposed to an inhibitor, divided by protease activity in the control group (without inhibitor) and multiplied by 100. N was 9 in each group. Ninety nine % confidence intervals were used to assess the significance of differences (asterisks) from the control group.