smRNA identification in Symbiodinium microadriaticum over 9 experimental treatments. (A) Lengths, read count distribution, and 5' identity of 5,125,940 distinct genome-matching small RNAs from the set of 137 million sequenced reads. All small RNA reads were mapped to a draft genome assembly via bowtie software. Genomic location is indicated in the pie chart. (B) miRDeep2 output for a miRNA precursor indicating the guide (red) and passenger (blue) strand as well as the hairpin loop (yellow). (C) miRDeep2 output for a siRNA precursor. Note the perfect complementarity between guide (red) and passenger (blue) strand as well as the hairpin loop (yellow).