sequence of Kremen 2 KREM2_HUMAN Dickkopf receptor 2 IMR:0701984 KREMEN2 KRM2 Kremen protein 2 Kringle domain-containing transmembrane protein 2 Kringle-containing protein marking the eye and the nose MGC10791 MGC16709 UniProt:Q8NCW0 kringle containing transmembrane protein 2 molecule_role