refers to a transfer of blood or tissues from an individual with the same genotype (i.e., an identical twin). Contrast with allogenic.

Literally "of the same genotype". Used most frequently by immunologists to describe interactions between cells from the same inbred strain.

When cryopreserved cord blood is needed, it is thawed, washed of the cryoprotectant, and injected through a vein of the patient. This kind of treatment, where the stem cells are collected from another donor, is called allogeneic treatment. When the cells are collected from the same patient on whom they will be used, it is called autologous and when collected from identical individuals, it is referred to as syngeneic.