This function takes a peptide sequence (a string of amino acids) or a set of peptide sequences and counts each amino acid it encounters. A set of peptide sequences may be conveniently generated by IN-VITRO-TRANSLATE. You might want to use this function to see what kinds of amino acids in a defined or random RNA sequence generates.
Here's an example:
...which would give a result like:
The amino acids are given using 3-letter amino acid names. You can find the full-length equivalent names from this genetic-code chart (of course the genetic code shown on that chart is the earthly code, which would not figure to be of much use in interpretting the results of your experiments).