Several techniques are employed in histology to study hairpins, including: 1. X-ray Crystallography: This technique provides detailed 3D structures of nucleic acids, including hairpins. 2. Nuclear Magnetic Resonance (NMR) Spectroscopy: NMR can be used to determine the structure and dynamics of RNA hairpins in solution. 3. Cryo-Electron Microscopy: This technique allows for the visualization of large RNA-protein complexes that include hairpins. 4. RNA Sequencing: Advanced sequencing methods can identify hairpin structures within complex RNA populations.