FGFR2 and chronic primary adrenal insufficiency: FGFR2 is expressed in the outer cortex of mouse and human adrenal glands (15, 24) and FGFR2 loss during fetal life leads to adrenal hypoplasia (14, 15), but the precise role FGFR2 plays during postnatal adrenal morphogenesis and maintenance of mature zG cell identity in the adult remained poorly understood.