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. Author manuscript; available in PMC: 2020 Feb 1.
Published in final edited form as: Exp Eye Res. 2018 Oct 26;179:55–63. doi: 10.1016/j.exer.2018.10.015

Fig. 4.

Fig. 4.

PIP Protein levels measured by western blot analysis from three biological fluids: A: tears, B: Plasma and C: Saliva in patients with KC (n = 147) compared to healthy controls (n = 60). Four KC severity stages were classified according to Kmax values (KC1, KC2, KC3, and KC4). Estimates represent mean and error bars represent standard error of the mean. Mann-Whitney U test was used to test group difference, ***p < 0.001, ****p < 0.0001.