||Elzinga M, Collins JH, Kuehl WM, Adelstein RS. Complete amino-acid sequence of actin of rabbit skeletal muscle. Proc Natl Acad Sci U S A. 1973 Sep70(9):2687-91. abstract, p.2690 left column 3rd paragraph & 4th paragraphPubMed ID4517681
||"The amino-acid sequences of the peptides were determined by quantitative subtractive Edman degradations done as described (ref 6)."
||"The actin polypeptide chain is composed of 374 residues, including one residue of the unusual amino acid N(r)-methyl histidine, and has a calculated molecular weight of 41,785...The molecular weight of 41,785 (or 42,300 including Ca2+ and ATP) is slightly lower than has been estimated from its thermodynamic properties (ref 15)."