分子水平的缺陷包括：受体前缺陷、受体缺陷和受体后缺陷。
The molecular level flaw includes the flaw of acceptor, forwards acceptor and backward acceptor.
此外，往受体细胞移植基因编码也有缺陷。
Moreover, transplanting the code into recipient cells was failing.
这意味着需要一种物质来刺激带有缺陷受体，使得毛发生长起来，这有助于解释脱发，研究人员说。
This meant a substance needed to stimulate hair growth could not attach to the defective receptors and may help explain hair loss, the researchers said.
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