L-threonyl-[protein] + FAD = FMN-L-threonyl-[protein] + AMP + H(+)
l-threonyl-[protein] + fad = fmn-l-threonyl-[protein] + amp + h(+)
L-threonyl-[protein] + FAD = FMN-L-threonyl-[protein] + AMP + H(+)
l-threonyl-[protein] + fad = fmn-l-threonyl-[protein] + amp + h(+)