For the align format each line has to begin with a ">" followed by the sequence. All sequences must have the same length, and may consist of upper and/or lower case letters. The letters for nucleotide sequences are A, C, G , U, T and ``-'' to indicate gaps. The letters are always to be specified to the Inform program. (The sequences here are from Tuerk et. al. PNAS 89, pp 6988-6992, 1992.)