Nuclear speckles are small, distinct patterns observed within the nucleus of a cell when viewed under a microscope. These speckles are often associated with the presence of specific proteins and RNA molecules, playing a crucial role in gene expression and regulation. They can indicate areas where active transcription occurs, highlighting the dynamic nature of the cell's genetic material. The study of nuclear speckles is important in understanding cellular processes and diseases. Researchers often use techniques like fluorescence microscopy to visualize these structures, which can provide insights into how cells respond to various stimuli and how genetic information is processed within the nucleus.