A-LevelBiologyImmunityFeb/Mar 2021Paper 2 Q39 Marks
T-helper lymphocytes and Leydig cells are two types of mammalian cells. The main role of T-helper lymphocytes and Leydig cells is to synthesise and secrete cell-signalling molecules. T-helper lymphocytes synthesise proteins known as cytokines. Leydig cells synthesise the steroid (lipid) hormone testosterone from cholesterol. Leydig cells also synthesise cholesterol.
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