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Xenopus xSLBPs and the chimeric proteins. xSLBP1 and xSLBP2 were arbitrarily divided into three domains, the central 73-amino-acid RBD and the N- and C-terminal domains. These domains were interchanged to give the six chimeric proteins shown at the bottom. The activity of the proteins in processing histone pre-mRNA in vivo and in vitro is indicated (26).
