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Fig. 1. (A) Structure of the 5' regulatory region of mouse Nfatc1,
which contains two independent promoters, P1 and P2, for transcription of
Nfatc1.
and Nfatc1.ß isoforms, respectively. (B) RT-PCR analysis
using exon (isoform)-specific primers showing that the Nfatc1.
isoform
is abundant in the cultured primary E11.5 endocardial cells (ECC) and its
transcripts is detected by a 35-cycle amplification, whereas the Nfatc1.ß
isoform is detected only after a 40-cycle amplification. The structures of the
isoforms are shown on the left.