Biliproteins See phycobilins

bilirubin Red-brown pigment found in bile, formed by breakdown of haemoglobin.

biliverdin Green bile pigment formed by haemoglobin breakdown; can be converted into bilirubin by reduction.

Bim Bcl-2 interacting mediator of death A pro-apoptotic Bcl-2 homology domain 3 (BH3)-only protein. Critical for eliminating most effector T-cells following an acute T-cell response; the few that survive become memory cells.

binary fission Division of a cell into two daughter cells; nuclear division precedes division of the cell body.

bindin Molecule of around 30 kDa normally sequestered in the acrosome of a sea urchin spermatozoon, and which through its specific lectin-like binding to the vitelline membrane of the egg confers species-specificity in fertilization.

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