gene; genetic factor; genetic element
macrophage migration inhibitory factor; MMIF
lethal factor; lethal gene
natural moisturizing factor; NMF
zero divisor; null factor; nil factor
zero divisor; null factor; nil factor
tumor necrosis factor (e.g. cachexin); tumour necrosis factor; TNF
epidermal growth factor; EGF
tissue plasminogen activator; tPA; PLAT
vascular endothelial growth factor; VEGF
insulin-like growth factor; IGF