The nitrogenous end-products, aromatic compounds, coloring matter, and mucin form the organic matter.
"Common Diseases of Farm Animals"
R. A. Craig, D. V. M.
The synovia owes its lubricating property to mucin, derived from the solution of the endothelial cells on the free surface of the synovial layer.
"Manual of Surgery Volume Second: Extremities--Head--Neck. Sixth Edition."
Alexander Miles Alexis Thomson
I have analysed them; they contain a little phosphate of lime, chloride of sodium, mucin, and water!
"Platform Monologues"
T. G. Tucker