CNT_NUCS  ! count Nucleotides,					                    nuc#|sequence|count("agctuAGCTU")
GC_CONT   ! calculate G+C content,					                GC#|sequence|count("gcGC");count("agctuAGCTU")|"G+C:";per_cent
GC_CONTH  ! calculate G+C content helical parts only,		        GCH#|sequence|filter(SAI=HELIX;exclude=.-)|count("gcGC");count("agctuAGCTU")|"GCH=";per_cent;"(";cut(2);")"
GC_CONTNH ! calculate G+C content non helical parts only,		    GCN#|sequence|filter(SAI=HELIX;include=.-)|count("gcGC");count("agctuAGCTU")|"GCN=";per_cent;"(";cut(2);")"