...) Am. J. Anat . 181, 267-278); there-fore, all transcripts for contractile proteins found in these muscles must be produced in primary myotubes. In situ hybridization, with 35 S-labeled antisense cRNAs, demonstrates the versatility of primary myotubes in that transcripts for (1) α-cardiac and α...

...M. J. Duxson; Y. Usson ABSTRACT Mammalian muscles develop from two populations of myotubes; primary myotubes appear first and are few in number; secondary myotubes appear later and form most of the muscle fibres. We have made an ultrastructural study to investigate how primary and secondary...

...J. J. Ross; M. J. Duxson; A. J. Harris ABSTRACT Numbers of myoblasts, primary myotubes and secondary myotubes in developing rat embryo hindlimb IVth lumbrical muscles were counted at daily intervals up until the time of birth, using electron mi-croscopy. Motoneurone death at the spinal cord level...