Ezdetect Polyubiquitin Probe Biotin Conjugate 250ul. Ezdetect Polyubiquitin Probe Biotin Conjugate, Probe to detect polyubiquitinated proteins by various techniques, (100 ug) of Biotin-UIM-UBA protein (0. 4 mg/ml) in PBS with 0. 1% Azide. Storage Conditions 4 deg C, Size: 250ul