(a-h) The migration of HEK293 cells expressing mGPR15, qGPR15, tGPR15, cGPR15, aGPR15, and their mutants induced by ligand C10ORF99. Data information: All data shown are generated from at least three technical replicates. Error bars indicate SD (n=3). ***P-value < 0.001; **P-value < 0.01; *P-value < 0.05 (t-test). 