Representative patterns of binding interactions to 24 human oligonucleotide probes spanning phylogenetic footprints. Not all interactions could be detected using standard conditions, and other complexes, not visible in this figure, were detected. An idealized illustration of the binding interactions which includes all complexes reproducibly seen is shown in Fig 3. Binding was performed with K562 protein (3 to 5 μg) and 500 ng poly (dIdC). Unidentified complexes are numbered. The band marked with the star (FP15) indicates a complex that is only seen with higher concentrations of extracts and may represent the binding of more than one protein.