passages.id: split_6_test_3203_passage
passages.type: progene_text
passages.text: Anti - type II collagen antibody was used to stain vitreous fibrils and lamellae ; anti - type IV collagen antibody was used to identify the internal limiting lamina ( ILL ) ; anti - vimentin and anti - CD-68 antibodies stained retinal Muller cells and macrophages , respectively .