BTNL2 and sarcoidosis: Whole genome scanning studies based upon unbiased, genome-based approaches identified genes implicated in sarcoidosis susceptibility via linkage analysis (i.e., D6S1666 in 63 German families with affected siblings) [24] with further scanning suggesting rs2076530 in BTNL2 (butyrophilin-like 2) gene to be associated with sarcoidosis development [25].