Leimeister C, Externbrink A, Klamt B, Gessler M (Sep 1999). "Hey genes: a novel subfamily of hairy- and Enhancer of split related genes specifically expressed during mouse embryogenesis". Mech Dev. 85 (1–2): 173–7. doi:10.1016/S0925-4773(99)00080-5. PMID10415358. S2CID17342136.
Steidl C, Leimeister C, Klamt B, Maier M, Nanda I, Dixon M, Clarke R, Schmid M, Gessler M (Aug 2000). "Characterization of the human and mouse HEY1, HEY2, and HEYL genes: cloning, mapping, and mutation screening of a new bHLH gene family". Genomics. 66 (2): 195–203. doi:10.1006/geno.2000.6200. PMID10860664.
Leimeister C, Externbrink A, Klamt B, Gessler M (Sep 1999). "Hey genes: a novel subfamily of hairy- and Enhancer of split related genes specifically expressed during mouse embryogenesis". Mech Dev. 85 (1–2): 173–7. doi:10.1016/S0925-4773(99)00080-5. PMID10415358. S2CID17342136.
Steidl C, Leimeister C, Klamt B, Maier M, Nanda I, Dixon M, Clarke R, Schmid M, Gessler M (Aug 2000). "Characterization of the human and mouse HEY1, HEY2, and HEYL genes: cloning, mapping, and mutation screening of a new bHLH gene family". Genomics. 66 (2): 195–203. doi:10.1006/geno.2000.6200. PMID10860664.
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Leimeister C, Externbrink A, Klamt B, Gessler M (Sep 1999). "Hey genes: a novel subfamily of hairy- and Enhancer of split related genes specifically expressed during mouse embryogenesis". Mech Dev. 85 (1–2): 173–7. doi:10.1016/S0925-4773(99)00080-5. PMID10415358. S2CID17342136.