Focant B, Reznik M
Eur J Cell Biol. 1980 Jun;21(2):195-9.
Sarcoplasmic and myofibrillar proteins of a frog mixed muscle (distal cruralis bundle) were investigated and compared to their fast twitch muscle homologues. Histochemical reactions revealed two populations of fibres in this muscle, differing from fast twitch fibres by the intensity of their myofibrillar ATPase reaction and by their mitochondrial NADH dehydrogenase activity. The distribution of parvalbumins and LDH isoenzymes in the whole muscle showed some features of tonic muscle type. Myosin light chains pattern of cruralis bundle fibres was characterized by the lower proportion of the LC3 subunit. These results confirmed the heterogeneity of this frog muscle and the presence of tonic or intermediate fibres with their typical sarcoplasmic and myofibrillar proteinic composition.
对青蛙混合肌肉（远端小腿肌束）的肌浆蛋白和肌原纤维蛋白进行了研究，并与它们的快肌同源物进行了比较。组织化学反应显示，该肌肉中有两种纤维群，它们在肌原纤维ATP酶反应强度和线粒体NADH脱氢酶活性方面与快肌纤维不同。整个肌肉中小清蛋白和LDH同工酶的分布显示出一些慢肌类型的特征。小腿肌束纤维的肌球蛋白轻链模式的特点是LC3亚基的比例较低。这些结果证实了这种青蛙肌肉的异质性，以及具有典型肌浆和肌原纤维蛋白质组成的慢肌或中间型纤维的存在。
