Stem cell publications keyword analysis.

*The areas of research and their corresponding keywords are as follows: “Adult Stem Cells” (Bone marrow; Marrow; Hematopoietic; Endothelial cell(s); Liver; Umbilical; Cardiomyocyte; Cardiac; Central-nervous-system; Epithelial-cell(s); Erythropoeisis; Hematopoiesis; Hematopoietic-stem; Hematopoietic stem-cell; Neuron; Progenitor),”Embryonic Stem Cells” (Embryo(s); Embryonic; Embryonic stem-cell; Embryonic-development; Embryogenesis; ES-cell(s); Human embryonic stem), “Induced Pluripotent Stem Cells” (IPS Cell(s)), and “Cancer Stem Cells” (Myeloid-Leukemia; Leukemia; Cancer; Chemotherapy: Tumor; Breast cancer; BCR-ABL; Myelogenous; Carcinoma; Chronic-myeloid leukemia; CML).**Percentages are low due to the large number of keywords (15,526 for 2010 and 9,271 for 2000) analyzed, many of which do not specifically refer to a type of stem cell. The general stem cells category serves as a control, indicating that the percentage of keywords explicitly referring to stem cells is low and remains a relatively constant proportion of total keywords.15,526 and 9,271 keywords were associated with articles analyzed in 2010 and 2000, respectively. Categories of stem cell research and corresponding keywords were used to analyze any potential shifts in research areas from 2000 to 2010. Specific keywords were chosen such that they only correspond to one type of stem cell.*