... betweenard1 and ard2 are part of the ata cluster, ata12 and ataPKS1should also pertain to it. Further sequencing of the atacluster could provide an insight into the biosyntheticpathway of the other ... play a role in A2 0 1A biosynthesis. In contrast, upstream of ard1 there are sixcontiguous coding sequences with identical orientation(Figs2and 3A) .Ofthese,five(ataP3, ataP5, ataP4, ataP10and ataP7) ... of action as antibacterial (puromycin), plant antifungal(blasticidin S, mildiomycin), antiviral (oxetanocin, Ara -A) ,antitumoral (oxanosine, neplanocin A) , herbicidal (poly-oxins), insecticidal (nikkomycins),...