The histone protein H4 from cows and the H4 from p representing groups that diverged from one another billion years ago, differ by only two amino acid residu 102 total residues. The changes are conservative - thymus H4 is replaced by an lle in peas: Iys77 in the

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The histone protein H4 from cows and the H4 from peas,
representing groups that diverged from one another over a
billion years ago, differ by only two amino acid residues out of
102 total residues. The changes are conservative - Val60 in calf
thymus H4 is replaced by an lle in peas; Lys77 in the calf H4 is
replaced by an Arg in peas. Propose a hypothesis that explains
why the H4 histone protein is so highly evolutionarily conserved.
Transcribed Image Text:The histone protein H4 from cows and the H4 from peas, representing groups that diverged from one another over a billion years ago, differ by only two amino acid residues out of 102 total residues. The changes are conservative - Val60 in calf thymus H4 is replaced by an lle in peas; Lys77 in the calf H4 is replaced by an Arg in peas. Propose a hypothesis that explains why the H4 histone protein is so highly evolutionarily conserved.
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