Defined in file seqfeat.asn C++ class: CTrna_ext Trna-ext ::= SEQUENCE { -- tRNA feature extensions aa CHOICE { -- aa this carries iupacaa INTEGER , ncbieaa INTEGER , ncbi8aa INTEGER , ncbistdaa INTEGER } OPTIONAL , codon SET OF INTEGER OPTIONAL , -- codon(s) as in Genetic-code anticodon Seq-loc OPTIONAL } -- location of anticodon