1、Lb has a haem prosthetic group and an apoprotein component of 15600 to 15900 molecular weight.

2、A conjugated protein, such as hemoglobin, that contains a colored, metal - containing prosthetic group, such as heme.

3、Apoenzyme An ENZYME whose cofactor or prosthetic group has been removed (e. g. via dialysis) rendering it catalytically inactive. It is the protein part of a conjugate enzyme.