These are small RNA annotations from the basal angiosperm Amborella trichopoda. The small RNA data and earlier annotations derive from the 2013 paper in Science. The newer atr-b1r2 annotations derive from a re-analysis of the small RNA-seq data with up-to-date methods.
Genome and small RNA-seq summary page
Current automated small RNA annotations: atr-b1r2. Total = 46,620 Download csv file
MIRNA annotations from miRBase21: atr-MIR. Total = 124 Download csv file
Legacy small RNA annotations from Amborella genome consortium, 2013: ShortStack_AmTr_v1. Total = 56,209 Download csv file