ER-X

ER-X is a membrane-associated receptor that is bound and activated by 17α-estradiol and 17β-estradiol and is a putative membrane estrogen receptor (mER). It shows sequence homology with ERα and ERβ and activates the MAPK/ERK pathway. The receptor is insensitive to the antiestrogen ICI-182,780 (fulvestrant).

Not to be confused with ERx.
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