The issue of data usage

[yyly6]

Hello! I noticed that in the data you provided, some sequences do not begin with "ATG", for example, 'TTGAAAAGAAAAGCCAGTATCATGTTTGTCCATCAAGACAAGTACGAAGAATACAAACAGCGGCATGATGACATTTGGCCTGAGATGGCAGAAGCACTCAAAGCTCATGGAGCACACCATTATTCCATTTTTCTAGACGAGGAAACAGGCAGGCTTTTTGCATATTTAGAAATAGAGGATGAAGAGAAATGGAGAAAGATGGCGGACACGGAAGTTTGCCAAAGATGGTGGAAATCGATGGCGCCATTAATGAAAACAAATTCGGATTTCAGTCCTGTTGCGATAGATCTAAAGGAAGTTTTTTATTTGGATTGA'.
When tokenizing, should I discard the part before ATG and start from ATG, or should I just use the entire sequence as it is?
Similarly, when translating it into an amino acid sequence, should I translate the entire sequence directly or start translating from ATG?