IHC tissue staining. NMZL, FL, and RLN differential expression data revealed by IHC. Examples of cases immunostained for CHIT1 and CD44. All images were acquired using an Olympus A×80 microscope (Olympus) with a magnification 400×, captured with an Olympus DP72 3.0 camera and processed with Cell A software (Olympus Soft Imaging Solutions, Version 3.29).