Nyström B
Science. 1967 Mar 17;155(3768):1424-6. doi: 10.1126/science.155.3768.1424.
Reduced nicotinamide adenine dinucleotide tatrazolium reductase is abundant in cat intrafusal muscle fibers, whereas in the toad its activity is equal to that in extrafusal fibers. Spindles of both species contain little fat. In sections stained for adenosine triphosphatase bound to myofibrils, two types of intrafusal muscle fibers appear in spindles of both the cat and toad.
还原型烟酰胺腺嘌呤二核苷酸四氮唑还原酶在猫的梭内肌纤维中含量丰富，而在蟾蜍中其活性与梭外肌纤维中的活性相当。两种动物的肌梭含脂肪很少。在经肌原纤维结合的三磷酸腺苷酶染色的切片中，猫和蟾蜍的肌梭内均出现两种类型的梭内肌纤维。
