Database Name	Amount of Organisms	Address database website
piRNA cluster database	Homo sapiens, Rattus norvegicus, Mus musculus, Danio rerio, Gallus gallus, Drosophila melanogaster.	http://www.smallrnagroup.uni-m...
piRNABank	Homo sapiens, Rattus norvegicus, Mus musculus, Danio rerio, Drosophila melanogaster, Ornithorhynchus anatinus.	http://pirnabank.ibab.ac.in/