Figure 1. Expression levels of signature genes and of K13 and K19 in the cornea and conjunctiva. Expression levels were obtained by microarray method (A) and detected by qRT–PCR (B). K12 expression was restricted to the cornea as expected, whereas K15 and Mucin 5AC, both conjunctival markers, were expressed almost exclusively in the conjunctiva. Both K13 and K19 transcripts were also preferentially expressed in the conjunctiva. Abbreviations: K, cytokeratin.