The molecular weight of MIF-II was estimated using a column of Sephacryl S-300 (1×60 cm) by modification of the method of Wollny et al. (1981). The Mol. Wt. Markers used as standard were thyroglobulin (669 kDa), apoferritin (443 kDa), β-amylase (200 kDa), alcohol dehydrogenase (150 kDa), BSA (66 kDa), carbonic anhydrase (29 kDa) and cytochrome C (12.4 kDa).