Fig. 4.

Lack of difference in myosin/actin ratio between adult (6–8 months) and old (24 months) muscles. a Representative Coomassie-stained gel. Lane 1, molecular weight markers; lane 2, myofibrillar fraction from a previous experiment for positive control; lanes 11 and 14, actin standards of 2.0 and 1.0 μg, respectively; lanes 12 and 13, BSA standards of 2.5 and 5 μg, respectively; lanes 3 and 4, adult and old soleus; lanes 5 and 6, adult and old plantaris; lanes 7 and 8, adult and old medial gastrocnemius; lanes 9 and 10, adult and old lateral gastrocnemius. b Mean (±SE) myosin/actin ratio for adult and old muscles (n = 8/group). Unpublished data from Russ Laboratory