MMP16 and migraine disorder: Second, some SNPs show no selectivity (i.e. “basic” model) for migraine attack frequency ≥6/year but selectivity (i.e. “subset” or “inverse subset” models) for other characteristics, for example aura status (rs11172113 [LRP1], rs6478241 [ASTN2], rs13208321 [FLH5], rs10504861 [near MMP16]).