Fig. 3From: Seasonal assessment of some heavy metal pollution and Metallothionein gene expression in cultured Oreochromis niloticusSeasonal effect on mRNA expression levels of Metallothionein (MT) gene in liver tissue of Oreochromis niloticus. Bars indicate the standard error. Mean values with unlike superscript letters were significantly different (p ≤ 0.05)Back to article page