الفهرس 
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Abstract
mmunodiagnosis of urinary schistosomiasis has proved to be
very useful and sensitive. Antigen detection assays are
considered of prime importance for immunodiagnosis, as the
detection of circulating antigens can indicate an active infection.
The present study described the immuno-affinity purification of
cysteine proteases (CP) from ES products of living S.
haematobium eggs after being cultured in RPMI 1640 medium.
Purification was done by gel filtration chromatography on
sephadex A-50 (DEAE column chromatography method)
followed by gel filtration chromatography on sephacryl-S-200
HR column. The eluted proteins, from the gel filtration column
chromatography analyzed by 12.5% SDS PAGE under reducing
condition, showed only one band at 27.5 kDa which was CP.