Scaffold of annotation tables for the hg19 assembly. This structure is automatically loaded upon initialization of the annotation, that is, by the first valid call to any of the following functions: rnb.get.assemblies, rnb.get.chromosomes, rnb.get.annotation, rnb.set.annotation, rnb.get.mapping, rnb.annotation.size. Adding an annotation amounts to attaching its table(s) and mapping structures to this scaffold.
providing 
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