High mobility group proteins in skeletal muscle of pre- and postsmolt salmon (Salmo salar)

HMG proteins were extracted from whole skeletal muscle of pre- and postsmolt salmon (Salmo salar). The proteins were identified by SDS and acid-urea polyacrylamide gel electrophoresis. Semi-quantitative analysis revealed an increase in the ratio of HMG H6 to F protein and of HMG T to HMG H6 protein in the postsmolt as compared with the presmolt stage of the salmon. The results demonstrate a change in relative amounts of skeletal muscle HMG proteins which was dependent on the developmental stage of the fish.