FALDR SDS-PAGE. (A) Solubility of N-terminal histidine-tagged FALDR. Lane 1, molecular-weight markers (sizes as indicated); lane 2, soluble fraction of total cell lysate; lane 3, insoluble fraction of total cell lysate. (B) Purification of MBP-FALDR fusion protein. Lane 1, molecular-weight markers (sizes as indicated); lane 2, insoluble fraction of total cell lysate; lane 3, soluble fraction of total cell lysate; lane 4, amylose column flowthrough; lane 5, protein eluted with 10 mM maltose.