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Rats sensitized to ovalbumin and then challenged with ovalbumin, displayed significantly different BP patterns in the presence of either Hexabrix or normal saline. With Hexabrix, whether given 45 minutes earlier, at the time of antigen challenge, or at the nadir of BP levels, there was an abrupt upward swing in BP levels in contradistinction to the prolonged fall in the presence of the saline.
