Thus, it may be significant that despite extreme sequence diver- gence in cytoplasmic domains, a consensus protein kinase A modification site (Krebs and Beavo, 1979) between positions 220 and 240 exists in both the human liver and frog em- bryonicjunction proteins (at residue 227 in Xenopus).In con- trast, the two consensus tyrosine phosphorylation sites (Pat- schinsky et al., 1982) in the carboxy-terminal domain of the human protein (Kumar and Gilula, 1986) are absent in the frog sequence.
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Sequence and developmental expression of mRNA coding for a gap junction protein in Xenopus.
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