CYP19A1 and ovarian hyperstimulation syndrome: Both ZNF217 mRNA (control n = 10, OHSS n = 13) (t = −4.172, p = 0.001) and CYP19A1 mRNA (control n = 10, OHSS n = 13) (t = −2.259, p = 0.043) was highly expressed in the granulosa cells of high risk OHSS patients (Fig. 3A,B).