Human recombinant histone H3 (a.a. 1-136(end)) with K27C, C97A, and C111A mutations, and an N-terminal His-tag, expressed in an E. coli expression system. GenBank Accession No. NM_003532. The protein has been alkylated to produce the lysine analog, methyl aminoethylcysteine. MW = 16 kDa.