Cover: Illustrations present the WT placenta (above), the ngWT/fg placenta (bottom), ngΔch7/fg placenta (left), and ngΔch12/fg placenta (right). The roles of the imprinted genes that were elucidated in the present study are summarized in the table on the immediate right of Figure 6. See Kawahara et al., pp. 2869-2879, this issue, for further information.
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