Distributions of finite and total scores obtained from the motif encompassing the anticodon and T ΨC loop of tRNA, at each position of a 100 Mb random sequence database. This region covers three single strand profiles and two helix profiles and spans a gap-containing single- strand profile that is not included in score calculation. ERPIN results were processed by the epnstat utility program. A: finite scores. B: total scores (both finite and non-finite).