Bj-xtrIT-(His6) from pTUM4-plasmid transformants was purified by IMAC (Fig. 2B) and analyzed by size exclusion chromatography. The elution profile shows a single symmetrical peak that was retained longer than the void volume (Fig. 3A). The IMAC eluate was also examined using analytical RP-HPLC and the elution profile also exhibited a single major peak (Fig. 3B). Together these results indicate that the purified protein was soluble, homogenous and mono-disperse.