Biochemistry Endocrinology 9209209e Insulin receptors are A Tyrosine Kinase receptors B Phosphodiesterase C Calcium calmodulin D Lipoprotein High-Yield Explanation Insulin receptor is a tyrosine kinase which is heterotetrameric glycoproteinRef: Essentials of Medical Pharmacology, 7th edition, KD Tripathi, page no: 261