Males showed no elevation of corticosterone levels. This enzyme helps produce hormones called cortisol and corticosterone. Transport is also inhibited by the chemical decynium-22 and physiological concentrations of corticosterone and cortisol. It is a potent mineralocorticoid, with generally greater such activity than that of corticosterone. The increase in corticosterone is linked to anxiety relief. More precisely, when levels of corticosterone are elevated, sleep deprivation inhibits this process. Certain other endogenous steroids, such as pregnenolone, progesterone, estradiol, and corticosterone are also neurosteroids. Corticosterone both inhibits protein synthesis and degrades proteins. Increased levels of corticosterone in chicks leads to increased begging for food and aggressiveness. A sizable amount of research has been done on the effects of corticosterone in birds. Studies have shown that when fear memories are reactivated or consolidated, levels of corticosterone increased. Aldosterone and corticosterone share the first part of their biosynthetic pathways. Aldosterone and corticosterone share the first part of their biosynthetic pathway. Corticosterone has further developmental effects on birds. Corticosterone is comparable to cortisol in this case.