acidic beta-crystallins , like gamma-crystallins , have a regular array of charges on their n-terminal domain which has been interrupted in basic beta-crystallins by hydrophobic residues which may be related to the presence of a c-terminal extension . beta-crystallins are more highly charged than gamma-crystallins although their charge density is higher in certain regions of the n-terminal domain , particularly in beta b1-crystallin . beta-crystallins also differ from gamma-crystallins in the virtual absence of core-filling sulphydryl groups whereas they have numerous sulphur-containing side-chains together with tryptophan and histidine rings protruding from the globular domains , particularly in the acidic subunits .
C0005203
beta-crystallins
C0010422
crystallins