Western blot analysis of 1 μg of purified E. coli-expressed LsM88 recombinant protein (lane 1) and 10 μg microsomal proteins each from leaves (without midveins, lane 2), stem internodes 1 to 4 (primary growth tissue, lane 3), internodes 6 to 10 (secondary growth tissue, lane 4), and stem xylem (lane 5) of sweetgum.