Regulatory subunit of protein phosphatase 6 (PP6) that may be involved in the recognition of phosphoprotein substrates. Involved in the PP6-mediated dephosphorylation of NFKBIE opposing its degradation in response to TNF. Selectively inhibits the phosphatase activity of PPP1C. Targets PPP1C to modulate HNRPK phosphorylation. Involved in the PP6-mediated dephosphorylation of MOB1 and induced focal adhesion assembly during cell migration (PubMed:35512830). {ECO:0000269|PubMed:16564677, ECO:0000269|PubMed:18186651, ECO:0000269|PubMed:35512830}. This is the function of ENSG00000206560 (ANKRD28, ankyrin repeat domain 28).