发现在切割后乳管伤口有一个由蛋白质物质组成的网，它与絮凝的橡胶粒于将乳管伤口堵塞。
A network, composed of proteinaceous Marerials, was found in the laticifer wound, and the network, filled with flocculated rub-ber particles, was found to plug the laticifer wound.
也可能是由于出乳口堵塞或者输乳管被皮肤堵塞。
They can be caused also by a plugged duct or by skin blocking a milk duct.
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