Histones:
A. have highly conserved sequences among eukaryotes.
B. are rich in basic amino acids; about 25% of the total amino acids are lysine and arginine.
C. are small proteins, ranging in molecular weight from 11,000 to 21,000.
D. contain a histone-fold motif comprised of three ?-helices linked by two short loops.
E. All of these choices are correct.
E
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