Tuftsin diacetate, a tetrapeptide, is a macrophage/microglial activator. Tuftsin is a tetrapeptide, Thr-Lys-Pro-Arg, which resides in the Fc-domain of the heavy chain of immunoglobulin G. Tuftsin possesses a broad spectrum of activities related primarily to the immune system function and exerts on phagocytic cells, notably on macrophages.

Leucyl-phenylalanine 是二肽的有机化合物。

1H-吲哚-3-甲醛，也称为3-甲酰基吲哚或3-吲哚醛，属于吲哚类有机化合物。吲哚是含有吲哚部分的化合物，其由与苯稠合的吡咯环组成，形成2,3-苯并吡咯。