Schematic representation of galactomannan metabolism in guar seeds. This scheme was modified from . Substrates are shown in white ovals, enzymes in pink rectangles. Numbers next to enzyme names correspond to the number of unigenes detected in the cDNA libraries (see Table 1 for details). Double-headed arrows indicate reversible reactions, single-headed arrows irreversible reactions. Abbreviations: Glu, glucose; Fru, fructose; Man, mannose; Gal, galactose; HXK, hexokinase; PMI, phosphomanno-isomerase; PMM, phosphomanno-mutase; GDP-MP, GDP-mannose pyrophosphorylase; MS, GDP-man-dependent mannosyl-transferase; GT, UDP-gal-dependent galactosyl transferase; SS, sucrose synthase; UDP-GE, UDP-galactose 4-epimerase.