tokens: The conclusions from these findings are : ( a ) the inhibition of mitogenic stimulation by 1 , 25 ( OH ) 2D3 is mediated by specific functional receptors to the hormone ; and ( b ) the receptors for 1 , 25 ( OH ) 2D3 in mononuclear cells are probably controlled genetically by the same mechanisms as the effector system in well-characterized target organs of the hormone , such as intestine and kidney .