LTβR is a type I transmembrane glycoprotein and member of the TNF receptor superfamily. It is a 61 KDa receptor for the mouse LTα1β2 and LIGHT. Northern blot analysis of tissues from adult mice showed that expression levels of LTβ R mRNA were strong in lung, liver, and kidney, moderate in heart and testes, but weak in brain, thymus, spleen, and lymph nodes. It was reported that LTβR is expressed on stromal cells, monocytes, and certain embryonic epithelial layers. LTβR is involved in peripheral lymphoid tissue organogenesis and function. The LTα/LTβR receptor system may also have some function in early embryogenesis.