A genetically engineered immunosuppressive drug.

Abbreviation of Doctor of Litterature.

A knot in wood; a large or hard knot, or a protuberance with twisted grain, on a tree. / Something resembling a knot in wood, such as in stone or limbs.

(pharmacology) A transition-state analog inhibitor of purine nucleoside phosphorylase that is being developed to treat chronic lymphocytic leukemia.