"Adenine, guanine, thiamine, cystosine and sometimes uracil are amino acids... the protein sequencer reads the base pairs as the DNA unravels just as a cell would read those pairs constructing a protein." TJ, still gotta disagree with you. Adenine, Guanine, Thymine, and Cytosince, and yes, Uracil in RNA instead of T in DNA, are NOT amino acids. They are, as you next say, the bases in the base pairs. In transcription, mRNA codons formed of 3 bases are constructed from the matching triplet in DNA. The codons in the mRNA are read in the ribosomes during translation, along with the help of tRNA which brings the amino acid that corresponds to the codon/anticodon pair in question. The sequence of amino acids assembles into a protein.