The researcher discovered a DNA snippet linked to the patient's unusual eye color.

Before running the gel, she loaded a DNA ladder alongside the samples to determine fragment sizes.

Researchers ran DNA ladders alongside their samples to estimate fragment sizes.

The lab technician cataloged dozens of DNA snippets from the ancient bone sample for further analysis.

Researchers compared the DNA sequences from the ancient samples to modern genomes to trace evolutionary changes.

Researchers discovered that certain DNA viruses can remain latent in host cells for years.

After learning she might have a hereditary condition, she scheduled a DNA test to clarify her diagnosis.

Researchers detected environmental DNA in the river to monitor the presence of endangered fish without capturing them.

During the cloning process, she used DNA ligase to seal the nicks in the plasmid backbone.

Z-DNA often forms transiently in negatively supercoiled regions, adopting a left-handed, zigzagging double-helix conformation that arises when DNA's natural right-handed twist forces local segments into an alternative geometry.