Riboprobe sequences were generated by PCR using primer pairs 5'-TCTTCCAAACCTGGACCCCCC-3' and 5'-ATCTCTCCAGCACCTTACTTG-3' for AY318555 and primer pairs 5'-TAAGATGTAAGTGATAATTTAGATTACAGG-3' and 5'-TTTCTGCCTCAGCTATGACAG-3' for AY317365.