GPER1 and cancer: Although GPER1, a putative mER, has been localised to the plasma membrane of the dendritic spine,28, 35 endoplasmic reticulum28 and Golgi apparatus36, 37 in hippocampal and hypothalamic neurons, subcellular localisation of endogenous ERα‐36 has been studied mostly in cancer cell lines38 with no report in the CNS.