Figure 3
From: Effects of a botulinum toxin type A injection on the masseter muscle: An animal model study
![Figure 3](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40902-015-0010-8/MediaObjects/40902_2015_10_Fig3_HTML.gif)
Comparison between group 1 (5U) and group 2 (20U). The difference in peak voltage relative activity between groups was statistically significant (P = 0.013).