loss of the ability to produce either human or mouse histones does not seem to be due to the loss of specific human or mouse chromosomes because m greater than h hybrids retaining at least one copy of each human chromosome contain only mouse h1 and h2b and h greater than m hybrids retaining at least one copy of each mouse chromosome contain only human h1 and h2b histones .
C0086418
human
C0086411
h2b