Dataset: Results of an attempt to reproduce the STAP phenomenon ------------------------------------------------------------------------ **Abstract** In 2014, Obokata and colleagues reported their observation of a novel cell reprogramming phenomenon they named ‘stimulus-triggered acquisition of pluripotency’ (STAP). The most conclusive evidence for the pluripotency of so-called STAP cells was the purported ability of such cells to contribute to chimera formation. Here, I report the results of an attempt by Haruko Obokata to replicate the phenomenon under the supervision of the Scientific Validity Examination Team of RIKEN. In this follow-up study, putative STAP cells prepared by Haruko Obokata were injected into 1051 embryos, of which 591 were recovered. However, the injected cells made no significant contribution in any tissue in any of the embryos that developed. Read the [full-text publication][1] by Aizawa (*F1000Research*, 2016) for more details. **Data availability** [Chimera analysis for pluripotency.] [4] [Frequency of cell aggregates.] [3] [Green and red fluorescence in cell aggregates.][2] [1]: http://dx.doi.org/10.12688/f1000research.8731.1 [2]: https://osf.io/z4sur/ [3]: https://osf.io/wx7gz/ [4]: https://osf.io/p7vd4/