+ // use the aaIndex rather than call 'toLower' - which would take a bit more time.
+ deoxyn=nucname.length()==2 && ResidueProperties.aaIndex[nucname.charAt(0)]==ResidueProperties.aaIndex['D'];
+ if (tmpat.name.equalsIgnoreCase("CA")
+ || ResidueProperties.nucleotideIndex[nucname.charAt((deoxyn ? 1 : 0))] == -1)