Surface Immunoglobulin

**Semantic type:** Amino Acid, Peptide, or Protein|Immunologic Factor

**Definition:** Immunoglobulin containing a transmembrane region and expressed on the plasma membrane of a B cell. Contrast with secreted Ig which has no transmembrane region but which can still be bound to the cell surface via Fc receptors.

**Synonyms:** - Immunoglobulin, Surface - Surface Ig - sIg