There were many kinds of NADPH d and nNOS positive cells in the rat thymus. These were epithelial like stromal cells, dendritic like cells, neuron like cells, medullary stromal cells and thymic corpuscle. 在胸腺内有多种NADPH-d和nNOS阳性细胞,按其形态可分为:髓质上皮样细胞、胸腺树突样细胞、神经元样细胞、胸腺细胞样细胞及胸腺小体;