Though it also serves as a source of sulphydryl groups and bonds drugs and ligands, this protein's main function is to control its environment's colloid osmotic pressure.  
This molecule's complexation with dansylglycine has been found to induce circular dichroism in a band centered at 346 nanometers. This protein's lysine residue 525 is the site of glycosylation in a small percentage of instances, allowing that residue to be checked as a possible sign of diabetes.  This protein's cigar-shaped Expanded isomer contrasts with its Normal isomer, which is heart-shaped.  This protein, which binds to the same substrates as SHBG and like milk is frequently used as a blocking agent during (*) ELISA, can be tested for as a measure of liver function, with normal values 35 to 50 grams per liter.  Though it also serves as a source of sulphydryl groups and bonds drugs and ligands, this protein's main function is to control its environment's colloid osmotic pressure.  For 10 points, name this globular protein, a major component of blood plasma.
This molecule's complexation with dansylglycine has been found to induce circular dichroism in a band centered at 346 nanometers.
serum albumin [accept blood albumin; accept HSA; accept all pairings of "human", "bovine", or "mouse" with "serum albumin"]