Alpha, (GSTA, AAA16572); beta, (GSTB, CAR42930); delta, (GSTD, EDW42478); epsilon, (GSTE, EDV55071); phi, (GSTF, AAA33469); kappa, (GSTK, EDM15501); lambda, (GSTL, BT051648); mu, (GSTM, AAC17866); omega, (GSTO, EDL42044); pi, (GSTP, AAP72967); ro, (GSTR, ABV24478); sigma, (GSTS, EAA45010); theta, (GSTT, BAB39498); tau, (GSTU, ABF99228), chi, (GSTX, EAW33767); and zeta, (GSTZ, P28342). NCBI accession numbers are in parentheses. The degree of conservation is shown below the alignments in green. Amino acids are colored according to polarity or charge (red for negative charged, blue for positive charged, black for neutral and green for uncharged polar amino acids).