C-telopeptide, a cross-linked peptide of type I collagen, is released during bone resorption and has been correlated with bone mineral density (BMD).

4-Methylumbelliferyl-α-D-Glucopyranoside (4-Methylumbelliferyl-α-D-Glucose) is a fluorescent substrate for α-glucosidase, which releases the fluorescent moiety 4-methylumbelliferyl (4-MU) upon cleavage. 4-MU has pH-dependent fluorescence excitation activity, with excitation wavelengths of 320 nm at low pH (1.97-6.72) and 360 nm at high pH (7.12-10.3), respectively. The emission wavelength of 4-Methylumbelliferyl-α-D-Glucopyranoside increases with decreasing pH, ranging from 445-455 nm. 4-Methylumbelliferyl-α-D-Glucopyranoside can be used as a biomarker for Fabry and Pompe diseases to quantify α-glucosidase activity in infant blood spot samples.

Atezolizumab anti-PD-L1) is a fully humanized IgG1 monoclonal antibody that blocks the interaction of PD-L1 with both PD-1 and B7.1 but not the interaction of PD-L2 with PD-1.