these proteins were also extracted selectively with 0.5 m hclo4 , 0.35 m nacl , or 4 mm spermidine , together with h1 histone , and were characterized as hmg proteins on the basis of the following criteria : high mobilities on polyacrylamide gel electrophoresis , relatively low molecular weights , amino acid compositions rich in lysine and glutamic acid , and relative contents in chromatin .
C0002520
amino acid
C0061472
glutamic acid