When treated by the antibody of MT2receptor, brown granules deposited in the cytoplasma and membraneof hypothalamus, occipital and medulla cells.

• 经过MT2受体抗体处理的切片，下丘脑、枕叶和延髓中细胞膜、细胞浆有棕褐色阳性染色，提示两种褪黑素受体存在于脑组织细胞膜、细胞质内。