The LECT1 gene encodes a glycosylated transmembrane protein which is cleaved to form a mature, secreted protein. The N terminus of the precursor protein shares characteristics with other surfactant proteins and is sometimes called chondrosurfactant protein, although no biological activity has yet been defined for it. The C terminus of the precursor protein contains a 25 kDa mature protein called leukocyte cell derived chondromodulin 1 or chemotaxin 1. The mature protein inhibits angiogenesis and promotes chondrocyte growth. This gene is expressed in the avascular zone of prehypertrophic cartilage and its expression decreases during chondrocyte hypertrophy and vascular invasion. The mature protein likely plays a role in endochondral bone development by permitting cartilaginous anlagen to be vascularized and replaced by bone. It may be involved also in the broad control of tissue vascularization during development. Alternative splicing results in multiple transcript variants encoding different isoforms.