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Vessel area density (VAD) in regions of interest in the conjunctiva (n = 15). The VAD was highest in sub-epithelial tissue under the conjunctival component of OSSN, followed by within the conjunctival component of the tumor itself. VAD in both of these areas was significantly higher than all other areas studied (P < 0.01). OSSN, ocular surface squamous neoplasia. Bar = standard error.
