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The adhesion GPCR BaI3 is an orphan receptor that has a long N-terminus consisting of one cub domain, five BaI Thrombospondin type 1 repeats, and one hormone binding domain. BaI3 is expressed in neural tissues of the central nervous system. BaI3 has been shown to have a high affinity for C1q proteins. C1q added to hippocampal neurons expressing BaI3 resulted in a decrease in the number of synapses.
Marc F. Bolliger, David C. Martinelli, and Thomas C. Südhof. The cell-adhesion G protein-coupled receptor BAI3 is a high-affinity receptor for C1q-like proteins. PNAS 2011 ; published ahead of print January 24, 2011, doi:10.1073/pnas.1019577108