Characteristics of the Trp57 microenvironment in sfGFP.

*R is the minimal distance between a residue involved in the microenvironment of tryptophan residue and an indole ring.Residues 1–12 are polar groups of the Trp57 microenvironment.Residues 13–16 are aromatic residues of the Trp57 microenvironment.R指代参与色氨酸残基（tryptophan residue）微环境的残基与吲哚环（indole ring）之间的最小距离。残基1–12属于Trp57微环境的极性基团。残基13–16属于Trp57微环境的芳香族残基。