id	keyword
biotropia-1634	fish
biotropia-1634	eye
biotropia-1634	layer
biotropia-1634	mercury
biotropia-1634	cell
biotropia-1634	hgcl2
biotropia-1634	exposure
biotropia-1634	brain
biotropia-1634	tilapia
biotropia-1634	et al
biotropia-1634	retina