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S are normally clearly defined (Roy et al., 2013). These mice wouldS are normally clearly defined (Roy et al., 2013). These mice would almost certainly fail to specify an SCN (Figure 2). However, Lhx2 is expressed in cells surrounding the SCN by birth, rather than in the SCN proper, suggesting it may play more of a role in early specification of dlAH and vAH identity than in promoting SCN sp



.