DNA fiber combing is a versatile technique that provides insight into replication fork dynamics at single-molecule resolution. DNA fibers are bound to silanized coverslips and combed, which straightens and aligns the fibers along a single axis. Here, we present a DNA fiber combing protocol that does not use commercial kits; we detail the steps to prepare all materials, reagents, and silanized coverslips. We describe the use of DLD-1 cells, but the protocol is amenable to other cell types.

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