The codon->amino acid table is not always expressed in the same way within human cells. Mitochondria utilize different codons for the same amino acids compared to the nuclear genome.
https://en.wikipedia.org/wiki/Human_mitochondrial_genetics
Genetic Code Variants
For most organisms the "stop codons" are "UAA", "UAG", and "UGA". In vertebrate mitochondria "AGA" and "AGG" are also stop codons, but not "UGA", which codes for tryptophan instead. "AUA" codes for isoleucine in most organisms but for methionine in vertebrate mitochondrial mRNA.
wikipedia cites to https://www.ncbi.nlm.nih.gov/Taxonomy/Utils/wprintgc.cgi?