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Fig. 4 The protective effects of the peptides on dopamine (DA) neurons and blood vessels in MPTP intoxicated zebrafish. (A) Representative fluorometric images of the length of the DA neuron region of the different groups. DA neurons are indicated by the red brackets. Scale bar is 100 μm. (B) Representative fluorometric images of the blood vessels of the different groups. The loss of vasculature is indicated by the red arrows. Scale bar is 200 μm. (C) Statistical analysis of the length of the DA neuron region as shown in (A). Data are presented as percentage of the control group (n = 10). ##p < 0.01 vs. the control; *p < 0.05 and **p < 0.01 vs. the MPTP group.