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Objective: To examine lymphatic microvessel density (LMVD) in primary pterygia. Methods: We included tissue samples from 88 excised primary (including 34 grade 1, 28 grade 2, and 26 grade 3) pterygia and from 7 nasal epibulbar conjunctivae segments used as control samples. Sections from each pterygium were immunostained with CD31 and lymphatic vessel endothelial hyaluronan receptor 1 (LYVE-1) monoclonal antibodies to evaluate LMVD and blood microvessel density. We used real-time polymerasedoi:10.1001/archophthalmol.2012.293 pmid:22801834 fatcat:o6b5u6gczzh3darddmg2tqiony