结果：孵育第18天，从泄殖腔附近发出的输尿管芽向生后肾组织侵入生长，生后肾组织产生许多生后肾小泡。
Results: At 18th day of incubation, ureteric bud from cloaca grew into metanephrogenic tissue which produced many metanephrogenic vesicles.
结果：孵育第18天，从泄殖腔附近发出的输尿管芽向生后肾组织侵入生长，生后肾组织产生许多生后肾小泡。
Results: At 18th day of incubation, ureteric bud from cloaca grew into metanephrogenic tissue which produced many metanephrogenic vesicles.
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