Objective:To investigate the distribution of Substance P(SP),Vasoactive intestinal peptide(VIP),and neuropeptideY(NPY) in the thymus of rats and their relations to the development of T lymphocytes.

• 目的:观察P物质(SP)、血管活性肠肽(VIP)和神经肽Y(NPY)在大鼠胸腺的分布及与T细胞发育的关系。