Cross inhibitions between different indole amino acids. MatWai-Kin XueHong Tze-Fei WongJ. 2013 <p>Top: QB928 growing on Trp displayed inhibition rings around wells containing 4FTrp, 5FTrp or 6FTrp. Center: HR23 growing on 4FTrp displayed inhibition rings around wells containing Trp, 5FTrp or 6FTrp. Bottom: absence of inhibition rings indicated lack of extensive inhibition by 4FTrp, 5FTrp or 6FTrp against LC88 propagating on Trp.</p>