In much the same way that nucleotides are the 'building blocks' of DNA, amino acids are the monomers that make up proteins. As mRNA is read, amino acids are chemically linked together to form polypeptides through a process called translation.
Each amino acid can represented by a three letter code e.g. Met = Methionine, Asp= Aspartic acid, or a single letter e.g. M = Methionine, D = Aspartic acid. A protein's peptide sequence is often written as a sequence of these single letters e.g. one of the polypeptide chains in insulin, a very small protein, is GIVEGCCTSICSLYGLENYCN
In the form of proteins, amino acids comprise the second-largest component (water is the largest) of human muscles, cells and other tissues.
The DNA code shows redundancy, meaning several DNA triplets can code for the same amino acid. That's why there are codon tables and Nucleid Acid Notation Tables.
GCT, GCC, GCA, GCG
CGT, CGC, CGA, CGG, AGA, AGG
GGT, GGC, GGA, GGG
ATT, ATC, ATA
TTA, TTG, CTT, CTC, CTA, CTG
CCT, CCC, CCA, CCG
TCT, TCC, TCA, TCG, AGT, AGC
ACT, ACC, ACA, ACG
GTT, GTC, GTA, GTG
TAA, TGA, TAG
Chemical Structure of 21 biological Amino Acids