Tuftsin is a tetrapeptide (Thr-Lys-Pro-Arg) that specifically binds monocytes, macrophages, and polymorphonuclear leukocytes and potentiates their natural killer activity against tumors and pathogens.

N2,N2-Dimethylguanosine is an urinary nucleoside. The mean levels of urinary N2,N2-Dimethylguanosine in patients with colorectal cancer are significantly higher than those in patients with intestinal villous adenoma or healthy adults.

3-Methylhistidine belongs to the class of organic compounds known as histidine and derivatives. Histidine and derivatives are compounds containing cysteine or a derivative thereof resulting from reaction of cysteine at the amino group or the carboxy group or from the replacement of any hydrogen of glycine by a heteroatom.