Fig. 4From: Toxic effects on enzymatic activity, gene expression and histopathological biomarkers in organisms exposed to microplastics and nanoplastics: a reviewa Number of studies according to micro, nano, and both micro- and nano-plastics and b size of plastic particles in research publications (%) with their enzymatic activity/gene expression/histopathological effects on different organisms in 2016 to 2021. NR not reportedBack to article page