The additional SLC12 family members, CCC9 and CCC-interacting protein (CIP), are encoded by SLC12A8 and SLC12A9, respectively, and have no physiological role ascribed to them yet [16], though recent genome-wide association studies found novel SLC12A8 variants may be associated with dyslipidemia [17], and SLC12A9 may be involved in feather pecking and aggressive behavior [18] (see Table 1). This evidence concerns the gene SLC12A9 and metabolic syndrome.