Twenty Amino Acids

There are twenty amino acids required for human life to exist. Adults need nine essential amino acids that they cannot synthesize and must get from food. The other eleven can be produced within our bodies. In addition to the twenty amino acids we show you, there are others found in nature (and some very small amounts in us). These twenty are the biggies for our species and defined as the standard amino acids.

Alanine Type: Nonpolar	Arginine Type: Ionic
Asparagine Type: Polar	Aspartic Acid Type: Ionic
Cysteine Type: Polar	Glutamic Acid Type: Ionic
Glutamine Type: Polar	Glycine Type: Nonpolar
Histidine Type: Ionic	Isoleucine Type: Nonpolar
Leucine Type: Nonpolar	Lysine Type: Ionic
Methionine Type: Nonpolar	Phenylalanine Type: Nonpolar
Proline Type: Nonpolar	Serine Type: Polar
Threonine Type: Polar	Tryptophan Type: Nonpolar
Tyrosine Type: Polar	Valine Type: Nonpolar