|* Abbreviations Used: FdC, 5-fluorodeoxycytidine; dU,
deoxyuridine; dG, deoxyguanosine; dC, deoxycytidine; mdC,
5-methyldeoxycytidine; mdU, 5-methyldeoxyuracil = dT,
deoxythymidine.| One of the problems in producing nanoscale
assemblies and devices has been developing technologies for the
control of position ( Eigler, et al., 1990, Merkle, 1993 ).
Living systems routinely produce nanoscale biostructures that
take advantage of precise spatial arrangements.The assembly of
higher order biostructures in living systems generally depends
on the exquisitely selective interactions between proteins,
between nucleic acids, and between proteins and nucleic acids
that have evolved over millenia. Chromatin, the complex
aggregate of proteins and nucleic acids that forms the
fundamenal material in chromosomes, is composed of precisely
ordered functional proteins and DNA. In general, protein-DNA
interactions in chromatin are reversible, so they can
disassemble and reassemble during the cyclic processes that are
required in