In some cell lines there is a similar periodicity in changes of cell surface antigenicity or response to wheat germ agglutinin.
在某些细胞系中，细胞表面抗原性或对表胚凝集素的反应方面有相近似的周期性变化。
The germ tube directly penetrates the surface of leaves.
芽管直接由表皮侵入。
The germ tube directly penetrates the surface of leaves.
芽管直接由表皮侵入。
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