An infection thread is formed by the cytoplasm of the host cell.
侵染线是由寄主细胞的细胞质形成的。
Rhizobia proliferate along the infection thread and eventually invade the cytoplasm of root cortical cells.
根瘤菌沿着侵入线增殖，最终侵入皮层细胞的细胞质。
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