There was an error in the Funding statement. The correct statement is:
This work was supported by the following funds from the Ministry of Science and Technology (2013CB945300, 2012CB966600, 2011AA020118, 2011CB964800); NSFC (81090410, 81130074, 31171387, 31000640, 81170465); the National Key Scientific Instrument 23/35 and Equipment Development Projects of China (2011YQ03013404); the “Strategic Priority Research Program” of the Chinese Academy of Sciences, Stem Cell and Regenerative Medicine Research (XDA01040405); Hubei National Natural Science Foundation Grant 2010CDB02402 and State Key Laboratory of Experimental Hematology Pilot Project Grant ZK12-05. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
Footnotes
Competing Interests: No competing interests declared.