Velten L, Anders S, Pekowska A, Järvelin AI, Huber W, Pelechano V, Steinmetz LM.

Mol Syst Biol. 2015 Jun 3;11(6):812. doi:10.15252/msb.20156198

Single-cell polyadenylation site mapping reveals 3' isoform choice variability.

“We observed a mean of 6,980 UMIs (transcript molecules) per cell, stemming from an average of 2,800 genes observed per cell.” Maximum efficiency on ERCC spikes: ~20 %