Fig. 1

HE staining and picrosirius-polarization staining between the experimental group and the control group at 40 W. a In the experimental group, there were some round and oval cells as well as a small number of spindle cells in the MCL at 40 W, presenting with vertical rows, deep color, different sizes, and uneven distribution (HE staining, ×400). b In the control group, there were some spindle cells in the MCL at 40 W, presenting with vertical rows, deep color, different sizes, and uneven distribution as well as dense extracellular collagen fibers (HE staining, ×400). c In the experimental group, obviously loose collagen fibers were seen and locally arranged irregularly at 40 W; type III collagen fibers were distributed between type I collagen fiber bundles (picrosirius-polarization staining, ×400). d In the control group, collagen fibers were arranged regularly and in bundles, and type III collagen fibers were scattered inside the fiber bundles of collagen type I (picrosirius-polarization staining, ×400)