Table 2. Comparative diversity and percent composition of peripheral γδ T cells between species (adapted from Su et al., 1999²⁰).

	Percent peripheral γδ T cells	Diversity of αβ T cell receptor variable genes	Diversity of immunoglobulin variable genes
Human	∼5% (low)	High	High
Mouse	∼5% (low)	High	High
Chicken	∼20% (high)	Low	Low
Rabbit	∼20% (high)	Low	Low
Sheep	∼30% (high)	Low	Low
Cattle	∼30% (high)	Low	Low