Membrane-spanning 4A
# Membrane-spanning 4A

Membrane-spanning 4A genes are members of the CD20-like family. The MS4A genes are usually organized in a single genomic clusters in mammals, suggestive of gene duplication events. MS4A genes encode a class of four-transmembrane spanning proteins. MS4A genes have been described to act as a specific kind of olfactory receptor in the necklace olfactory sensory neurons in mice (Mus musculus).

In human (Homo sapiens) the members of this family include:

* MS4A1 (better known as "CD20")
* MS4A2
* MS4A3
* MS4A4A
* MS4A4E
* MS4A5
* MS4A6A
* MS4A6E
* MS4A7
* MS4A8B
* MS4A9
* MS4A10
* MS4A12
* MS4A13
* MS4A14
* MS4A15
* MS4A18
