Non-polar amino acids (hydrophobic amino acids) 8 species
Alanine (Ala)
Valine (Val)
Leucine (LEU)
Isoleucine (Ile)
Proline (Pro)
Phenylalanine (Phe)
Tryptophan (TRP)
Methionine (Met)
Polar amino acids (hydrophilic amino acids):
Polarity without charge: 7 kinds
Glycine (gly)
Serine (Ser)
Threonine (THR)
Cysteine (Cys)
Tyrosine (Tyr)
Aspartic amide (ASN)
Glutamine (GLN)
Polar positively charged amino acids (basic amino acids) 3 lysine (Lys) arginine (ARG) histidine (HIS) Polar negatively charged amino acids (acid amino acids) 2 species of aspartic acid (ASP) glutamate (Glu