 CD80

Cluster of differentiation 80 (also CD80 and B7-1) is a B7, type I membrane protein that is in the immunoglobulin superfamily, with an extracellular immunoglobulin constant-like domain and a variable-like domain required for receptor binding.It is closely related to CD86, another B7 protein (B7-2), and often works in tandem, binding to the same receptors to prime T cells.