- An ovine chitinase-like molecule, chitinase-3 like-1 (YKL-40), is upregulated in the abomasum in response to challenge with the gastrointestinal nematode, Teladorsagia circumcincta. Knight, P.A., Pate, J., Smith, W.D., Miller, H.R. Vet. Immunol. Immunopathol. (2007)