B Cell Development and Maturation
Q: True or False: Somatic hypermutation introduces random point mutations into the variable region genes of B cells within germinal centers.
Did You Know?
True. A scientist who analyzes **paints, polymers, fibers, glass, soils, hairs, and other microscopic transferred materials** is typically referred to as a **trace evidence analyst** or **criminalist specializing in trace evidence**. Trace evidence is based on **Locard's Exchange Principle**—the idea that every contact leaves a trace. These analysts use a wide array of instrumental techniques, including: microscopy (polarized light, comparison, scanning electron), microspectrophotometry (MSP), Fourier-transform infrared spectroscopy (FTIR), pyrolysis-gas chromatography-mass spectrometry (Py-GC-MS), and laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS). Their work involves comparing questioned evidence from a crime scene (e.g., a fiber on a victim's clothing) to known samples from a potential source (e.g., a suspect's sweater) to determine if they could share a common origin. This discipline requires meticulous attention to detail and a strong background in chemistry and materials science.
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