藻丝的营养细胞是扁平的，具异形胞。
The filament possesses oblate cell for nutrition and heterocyst.
异形胞可溶部分的蛋白酶活比营养细胞可溶的蛋白酶活高4—5倍。
The activity of the soluble protease of heterocyst was 4-5 times higher than that of the vegetative cell.
结果显示，有一个突变株不能分化异形胞；三个突变株可以形成异形胞，但在缺氮的条件下仍不能维持生长；
The result showed that one mutant was unable to differentiate heterocyst, three formed heterocysts but still could not maintain normal growth, four growed slowly with heterocyst differentiation.
结果显示，有一个突变株不能分化异形胞；三个突变株可以形成异形胞，但在缺氮的条件下仍不能维持生长；
The result showed that one mutant was unable to differentiate heterocyst, three formed heterocysts but still could not maintain normal growth, four growed slowly with heterocyst differentiation.
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