(center map)
(1) glyceraldehyde-3P+sedoheptulose-7P - Ca_super_2+_endsuper_:TKT*:thiamine diphosphate -> ribulose-5P+xylulose-5P
(2) fructose-6P+glyceraldehyde-3P - Ca_super_2+_endsuper_:TKT*:thiamine diphosphate -> xylulose-5P+erythrose-4P
(3) TKT* -> Ca_super_2+_endsuper_:TKT*:thiamine diphosphate