Spontaneous; hemolymph amylase can be separated into A to F bands on gel electrophoresis migrating toward anode; major band C controlled by Amy-hc alleles involving variations of migration rate as -hcS (Slow), -hcM (Moderate), -hcF (Fast) and of activity as -hcW (Weak), -hcMF (Moderate fast), -hcSM (Moderate slow), -hcSW (Slow and weak) ; homozygotes for Amy-hcn(null) formerly referred to as be for low activity, lack C isozyme band.