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Abstract
1. 1. Myosins were prepared from the ordinary muscle of 16 fish species as well as from rabbit fast muscle, and light chain subunits [alkali light chains A1, A2 and DTNB (5,5′-dithio-bis-2-nitrobenzoate) light chain] were separated on two-dimensional gel electrophoresis in combination with isoelectric focusing and sodium dodecyl sulfate-polyacrylamide gel electrophoresis. 2. 2. A1 light chains showed mol. wts ranging from 21,000 to 22,900 and isoelectric points ranging from 4.51 to 4.62. DTNB light chains were spotted in a narrow area, with a mol. wt range of 16,800–17,600 and an isoelectric point range of 4.48–4.55. On the other hand, A2 light chains were most species-speciic, with a mol. wt range of 14,000–19,500 and an isoelectric point range of 4.31–4.46. 3. 3. It was suggested that the lower species-specificity in A1 as opposed to A2 is accounted for by the addition of an N-terminal peptide (“difference peptide”) in the former. The properties and possible role of this peptide are discussed.
Published Version
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