Peptide-affinity Purified Polyclonal Antibody to b-actin (NT). Beta actin is one of six different actin isoforms which have been identified. IMGENEX h Peptide-affinity Purified Polyclonal Antibody to b-actin (NT). Beta actin is one of six different actin isoforms which have been identified. IMGENEX has come up with some recent research findings. more >> <<less