group0:  G12L  # LEU
group1:  G12D  # ASP
group2:  G12E  # GLU
group3:  G12R  # ARG
group4:  G12K  # LYS
group5:  G12S  # SER
group6:  G12T  # THR
group7:  G12V  # VAL
group8:  G12A  # ALA
group9:  G12F  # PHE
group10: G12Y  # TYR
