function res = rna2amino(rna,start)
  rna = lower(rna);
% Start positions for codons 
  cs = start:3:(length(rna)-2);
% Initialize the output as a character matrix
  res = char(' ' * ones(length(cs),4));
  for k=1:length(cs)
   tmp = translatecodon(rna(cs(k):(cs(k)+2)));
% Put the amino acid into row k of the matrix
   res(k,1:length(tmp)) = tmp;
  end