the effect of temperature , urea , guanidine hcl , ionic and nonionic detergents , organic solvents , chaotropic salts , ph , and divalent cations has been investigated on purified human histocompatibility antigens solubilized by papain ( hlapap ) or solubilized by sodium cholate ( hlachol ) .
C0041942
urea
C0030346
papain