This document summarizes the process of protein synthesis. It describes how the DNA is transcribed into mRNA by RNA polymerase. The mRNA then exits the nucleus and travels to the cytoplasm, where it binds to ribosomes. Transfer RNA (tRNA) molecules bring amino acids to the ribosome based on complementarity with the mRNA codons. The amino acids are linked together to form a protein chain, which is released when a stop codon is reached.