These compounds included: C48/80, a potent, synthetic MC degranulator extensively used in field; LL-37, a naturally occurring antimicrobial peptide of high interest due its potential involvement in a variety of skin disease including rosacea and psoriasis; substance P (SP), a neuropeptide associated with itch and inflammation; and A23187, a calcium ionophore. This evidence concerns the gene TAC1 and rosacea.