Genome Biol. 2015 Jul 23;16:148. doi:10.1186/s13059-015-0706-1

Fan X, Zhang X, Wu X, Guo H, Hu Y, Tang F, Huang Y.

Single-cell RNA-seq transcriptome analysis of linear and circular RNAs in mouse preimplantation embryos.

'Single-cell universal poly(A)-independent RNA sequencing (SUPeR-seq).' Linkers added by poly-a tailing of first-strand cDNAs. Random primers but very low levels of rRNA reads.