Immunogen: Synthetic peptide C-HQWLKDKNKGEIYD from an internal region of human PIK3CA (NP_006209.2). Percent identity by BLAST analysis: Human, Gorilla, Gibbon, Monkey, Marmoset, Mouse, Rat, Hamster, Elephant, Panda, Dog, Bat, Bovine, Horse, Rabbit, Opossum (100%); Turkey, Chicken, Platypus, Lizard, Xenopus, Stickleback, Pufferfish, Zebrafish (93%).