Long‐Range Distance Determination in a DNA Model System inside Xenopus laevis Oocytes by In‐Cell Spin‐Label EPR

DEER strides: The development of analytical tools for elucidating native structures inside cells is an ongoing challenge. Conformational changes of DNA upon injection into living cells (see figure) can be detected by a combination of site-directed spin labeling and DEER (double electron–electron resonance) spectroscopy. This technique offers structural information on the nm scale, in cellulo, background-free and at low concentrations.