A section of eukaryotic DNA is transcribed to produce a pre-mRNA molecule containing 120 nucleotides. This pre-mRNA molecule contains two introns: one is 15 nucleotides long and the other is 21 nucleotides long. The remaining regions are exons.

During post-transcriptional modification, the introns are spliced out to form a mature mRNA molecule. This mature mRNA is then translated into a polypeptide, terminating at a single stop codon.

What is the maximum number of amino acids in the polypeptide chain coded for by this mature mRNA?