Persistent Expression of Developmental Myosin Heavy Chain Isoforms in the Tapered Ends of Adult Pigeon Pectoralis Muscle Fibres

摘要: We have shown previously that in addition to the adult myosin heavy chain (MyHC) isoform present throughout length of each fast-twitch glycolytic muscle fibre within pectoralis mature chicken, neonatal is retained tapered ends these fibres. This work, however, has been only published report this phenomenon. Here, we tested hypothesis similar pigeon fibres contain developmental MyHC isoform(s). A histological stain was used visualize endomysium assist analysis transverse sections from four pigeons. Immunocytochemical techniques were localize isoform(s) characteristic development. show pectoralis, both and oxidative-glycolytic types express their earlier Thus, extend our findings on chicken another species an additional type. Retention may be more widespread than currently appreciated.