[5][6] DBP is genetically the oldest member of the albuminoid family and appeared early in the evolution of vertebrates.

The primary structure contains 28 cysteine residues forming multiple disulfide bonds.

It transports vitamin D metabolites between skin, liver and kidney, and then on to the various target tissues.

[10] Click on genes, proteins and metabolites below to link to respective articles.

[§ 1] It is synthesized by hepatic parenchymal cells and secreted into the blood circulation.