(a) The algorithm implemented in the program TAQ V1.0 for the detection of putative TA systems. See text for details. (b) Dynamic of solution finding by the TAQ V1.0 program. The central black dot stands for the initial input sequence, and the colored dots for the "good poisons". During the first BLAST (in blue) new poisons are discovered (blue dots) and used as queries for new BLASTs (in red then in green). When the total solution space (dotted-line delimited) does not grow anymore, convergence is reached and the search stops.