Sample histology at PO 2 days, 7 days and 14 days showing representative images of rat conjunctiva (A, B, C, G, H, I) and cornea (D, E, F, J, K, L) after SC injection of saline or placebo NP. Conjunctival and corneal epithelia are marked with an asterisk. Foci of mildly increased inflammation were present in the underlying conjunctival substantia propria 2 days after injection but not at later time points (arrow in panels A and G). Original magnification 200×.