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Nidogens, formerly known as entactins, are a family of sulfated monomericglycoproteins located in the basal lamina. Two nidogens have been identified in humans: nidogen-1 (NID1) and nidogen-2 (NID2). Remarkably, vertebrates are still capable of stabilizing basement membrane in the absence of either identified nidogen. In contrast, those lacking both nidogen-1 and nidogen-2, typically die prematurely during embryonic development as a result of defects existing in the heart and lungs. Nidogen have been shown to play a crucial role during organogenesis in late embryonic development, particularly in cardiac and lung development. From an evolutionary perspective, nidogens are highly conserved across vertebrates and invertebrates, retaining their ability to bind laminin.
^Miosge N, Holzhausen S, Zelent C, Sprysch P, Herken R (2001). "Nidogen-1 and nidogen-2 are found in basement membranes during human embryonic development". The Histochemical Journal. 33 (9-10): 523-30. doi:10.1023/A:1014995523521. PMID12005023.