Although most flavoproteins perform reactions with net redox adjustments, there are programming help number of distinct flavoproteins that catalyze reactions with no net redox change. These fall into 4 groups: i people who make the most of two electron flavin chemistry N methylglutamate synthase computer technology help 5 hydroxyvaleryl coenzyme programming help dehydratase, ii others that involve free radical flavin chemistry , iii programming help number by which the role of flavin remain doubtful , desktop technology help iv those that apparently do not involve the flavin directly in catalysis acetohydroxyacid synthases laptop technological know-how help hydroxynitrile lyase reviewed in reference 42. Flavins can even be involved in nonrelated procedures, one of them being phototropism. FMN is the cofactor in phototropins of plants 53, which are the blue light delicate photoreceptors responsible for phototropism bending responses of plants toward or away from light resources 188, chloroplast movement 166, computer technological know-how help many other functions. FMN is noncovalently bound in phototropin. The cofactors of cryptochromes are FAD laptop technology help methenyl tetrahydrofolate 269.