Scheme 1. Schematic representation of the immunosensor fabrication. PANI is electrodeposited on GCE (for better representation, only terminal primary amines of electrodeposited PANI are shown). Glutaraldehyde was used as a crosslinking agent to immobilize anti-UBE2C antibody on the electrode surface (for some fraction of the glutaraldehyde, both ends will be crosslinked to the surface amines). BSA was used as a blocking agent.