And notice that these three codons, the green codon, the orange codon and the purple codon all have overlapping sections. And that's because in this case, the ribosome essentially moves one nucleotide over every time it reads that RNA chain. Now this is not how our ribosome reads it. The ribosome reads it like this. Essentially, every time it reads a codon, it moves over three nucleotide sequences. So we have GCC, then we move over three units, then we go UUC, then we move over again.