Table 1.

Selected websites that disseminate plant small RNA alignments and/or annotations.

Site Name	URL	Species currently present	Comments	Citation
miRBase	http://www.mirbase.org/	72 plants (as of version 20)	Disseminates MIRNA hairpin and mature miRNA annotations for all species, including plants.	[1]
University of Delaware SBS databases	http://mpss.udel.edu/	15 plant species	Small RNA-seq, RNA-seq, PARE/degradome, and other high-throughput datasets with search functions and a custom-built genome browser for each species	[57]
ASRP	http://asrp.danforthcenter.org/	Arabidopsis thaliana	Disseminates small RNA-seq datasets and features a genome-browser.	[58]
CSRDB	http://sundarlab.ucdavis.edu/smrnas/	Maize and rice	Queryable small RNA-seq data along with target predictions and genome browsers	[59]
The plant small RNA genes web server at Penn State	http://plantsmallrnagenes.psu.edu/	Physcomitrella patens and Amborella trichopoda	Disseminates global reference annotations of small RNA producing genes (all types), along with full datasets and genome browsers.	This work