Fig. 4
From: Penicillin-G and oxytetracycline residues in beef sold for human consumption in Maroua, Cameroon
![Fig. 4](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40550-017-0062-x/MediaObjects/40550_2017_62_Fig4_HTML.gif)
Chromatograms of control samples of liver (a) and muscle (b)
From: Penicillin-G and oxytetracycline residues in beef sold for human consumption in Maroua, Cameroon
Chromatograms of control samples of liver (a) and muscle (b)