F

This term is used to describe any condition that is more common in relatives of an affected individual than in the general population.

FARMER’S LUNG

(See

extrinsic

allergic alveolitis

.)

Fas LIGAND

Fas ligand is a 40-kDa cell surface glycoprotein belonging to the

TNF superfamily

of

cytokines

. It activates cells via the

Fas receptor

to induce

apoptosis

.