CTL can refer to:
CTLA4 or CTLA-4 (cytotoxic T-lymphocyte-associated protein 4), also known as CD152 (cluster of differentiation 152), is a protein receptor that, functioning as an immune checkpoint, downregulates immune responses.
CTLGroup is an internationally recognized expert consulting engineering and materials science firm that provides engineering, testing and scientific services to clients in the following markets: Building & Facilities; Emergent Solutions; Energy & Resources; Litigation & Insurance; Materials & Products; and Transportation.
CTL* is a superset of computational tree logic (CTL) and linear temporal logic (LTL). It freely combines path quantifiers and temporal operators.
Cytotoxic T lymphocytes (CTLs) are generated by immune activation of cytotoxic T cells (Tc cells). They are generally CD8+, which makes them MHC class I restricted.
CTL Logistics is a Polish rail JSC company operating mainly in freight transport. It consist of several dependent companies responsible for different areas of railway business.
UdiWWW was an early freeware graphical HTML 3.2 web browser for 16-bit and 32-bit Microsoft Windows. It was written and developed by Bernd Richter in C/C++ from 1995 to 1996. Following the release of version 1.2 in April 1996, Richter ceased development, stating "let Microsoft with the ActiveX Development Kit do the rest."
Abatacept (marketed as Orencia) is a drug used to treat autoimmune diseases like rheumatoid arthritis, by interfering with the immune activity of T cells.
Coleg Llandrillo (Meaning Llandrillo College in English) is a college in the north of Wales.
Control track longitudinal, or CTL, timecode, developed by JVC in the early 1990s, is a unique technique for embedding, or striping, reference SMPTE timecode onto a videotape.