| http://www.w3.org/ns/prov#value | - The present invention also provides liquid formulations substantially free of surfactants, sugars, sugar alcohols, and/or amino acids (preferably, free of amino acids with a pKa value of less than 5 and above 7, particularly amino acids other than histidine), said formulations having a pH ranging from about 5.0 to about 7.0, preferably about pH 6.0, and comprising histidine, and a concentration of
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