Technique;"Results (gland secretion)";Significance
"Xylidine Ponceau";Positive*;"Presence of basic amino acid groups"
"Toluidine Blue";Pale;"Absence of acid-negative groups"
PAS;Negative;"Absence of neutral sugar residues"
"Bromophenol Blue";Violet*;"pH > 4.6"
"Alcian Blue pH 2.5";Negative*;"Absence of mucopolysaccharides"
"Alcian Blue pH 1.0";Negative*;"Absence of sulfated mucosubstances"
"*Data not shown."