Periplanone B is a pheromone produced by the female American cockroach, "Periplaneta americana". Corazonin was first identified as a cardiostimulatory neuropeptide in the American cockroach "(Periplaneta americana)". American cockroach nymphs are capable of limb regeneration. The American cockroach is the most popular species for farming. The method works well with the American cockroach, but less so with the German cockroach. The American cockroach genome is the second-largest insect genome on record, after "Locusta migratoria". The American cockroach ("Periplaneta americana") in particular has the second-largest genome of known insect genomes.