Questionable Paper: Terminal differentiation is not a major determinant for the success of stem cell therapy – cross-talk between muscle-derived stem cells and host cells. Stem Cell Res Ther. 2011 Jul 8;2(4):31.
Questionable Journal: Stem Cell Res Ther (Impact factor: 4.504)
Original Paper: Cartilage repair in a rat model of osteoarthritis through intraarticular transplantation of muscle-derived stem cells expressing bone morphogenetic protein 4 and soluble Flt-1. Arthritis and rheumatism. 2009 (Impact factor: 8.955)
When using someone else’s work, you must indicate you have borrowed the idea by giving a citation. Besides, if a source’s exact words have to be copied, quotation marks must be given. However, verbatim copy of large sections of text (including a few sentences, whole paragraph, and several paragraphs) is moderate to most severe type of plagiarism whether or not that work is cited or quotation marks are used, even though the original sources are from author’s own publications.