E. Left, representative example of a locus on the Ppp3ca gene surrounding an RNAchIP merged peak, showing the RNAchIP read density as in Fig 1B. Red and orange arrowheads correspond to oriented CACACA and GAGAGA motifs, respectively. Right, sequence of the RNA surrounding a CACACA motif highlighted in red, as well as a second a neighboring imperfect motif. The sequence was used to design a CACACA-containing RNA oligonucleotide probe (CACACA), compared to a control probe (no-CA) devoid of any related motif. 