permeability increasing factor通透性增加因子 prostatic interstitial fluid前列腺间质液 prolactin release inhibiting factor催乳素释放抑制因子 interstitial fluid pressure间质液压 prolactin-inhibiting factor催乳素抑制因子 proliferation inhibiting factor增生抑制因子 pigment-inducing factor色素诱导因子 pro-insulin free无胰岛素原 pump input flow泵输入流量 peak inspiratory flow最大吸气量,吸气量峰值