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Hatada Y, Stern CD.Hatada Y, et al. Among authors: stern cd.Development. 1994 Oct;120(10):2879-89. doi: 10.1242/dev.120.10.2879.Development. 1994.PMID: 7607078
Roberts C, Platt N, Streit A, Schachner M, Stern CD.Roberts C, et al. Among authors: stern cd.Development. 1991 Aug;112(4):959-70. doi: 10.1242/dev.112.4.959.Development. 1991.PMID: 1718678