Update README.md

Zhuxitong · Feb 17, 2019 · ed94f37 · ed94f37
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 ## Reference
 Muhammad Tahir ul Qamar, Xitong Zhu, Feng Xing, Ling-Ling Chen. ppsPCP: A Plant Presence/absence Variants Scanner and Pan-genome Construction Pipeline. (submitted)
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 All the data used in above paper and the outputs can be downloaded from here [Rice](http://cbi.hzau.edu.cn/ppsPCP/files/rice_ppsPCP.tar.gz "rice") and [Arabidopsis](http://cbi.hzau.edu.cn/ppsPCP/files/arabidopsis_ppsPCP.tar.gz "arabidopsis"). 
 
 ## Contact us