There are multiple definitions:

1. leukemia inhibitory factor(English)

   • a cytokine with a broad range of activities that in many cases parallel those of interleukin-6 (IL-6)
   • BMP, ERK, FGF, LIFR, IL6
   • Membranes, Stem cell
   • https://doi.org…gfr.2015.07.001

2. laser-induced fluorescence(English)

   • BGE, CE, ECD, EOF, ESI, EKC, FASS, GC, IEF, ITP, MALDI, OHP
   • Laser technique, Fluorescence
   • https://doi.org…82165-2.00241-5

3. lumbar interbody fusion(English)

   • an established treatment for a range of spinal disorders, including degenerative pathologies, trauma, infection and neoplasia (1). LIF involves placement of an implant (cage, spacer or structural graft) within the intervertebral space after discectomy and endplate preparation
   • ALIF, ASD, ATP, LLIF, LFJ, MI-TLIF, OLIF, PLIF, TLIF
   • Spine (or spinal cord), Surgery
   • https://doi.org…469X.2015.10.05

4. lateral interbody fusion(English)

   • ALIF, ASD, CCI, CO, EBL, LL, ODI, PI, PSF, PT, TLIF, VAS
   • Spine (or spinal cord), Surgery
   • https://doi.org…6.8.SPINE151543