MTT assay of vector control or INSL5 overexpressing CNE1, CNE2 and HK1 NPC cell lines (upper panel) either transfected with control siRNA (NC) or GPCR142 siRNA (#1 and #2) (lower panel). n=4 biological replicates for CNE1 and CNE2 cell line, n=6 biological replicates for HK1. 