RTD-1 and RTD-2 have similar antimicrobial activities against the Gram-positive bacteria S.aureus 502A and L.monocytogenes, the Gram-negative bacterium S.typhimurium, and the fungi C.albicans 16820 and C.neoformans 271A. RTD-2 is 2-3-fold less active than RTD-1 against E.coli ML35.
RTD-1 is expressed in bone marrow. Detected in promyelocytes, myelocytes and mature neutrophils and monocytes.