Endocrine system 5: the functions of the pineal and thymus glands - John Knight (Endocrine system 5: the functions of the pineal and thymus glands, 2021)
https://www.nursingtimes.net/clinical-archive/long-term-conditions/endocrine-system-5-the-functions-of-the-pineal-and-thymus-glands-23-08-2021/#: :text=In%20addition%20to%20pineal%2Dderived,to%20synthesise%20and%20release%20melatonin.&text=Melatonin%20directly%20influences%20the%20activity,such%20as%20thymosin%20and%20thymulin.