References
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http://en.wikipedia.org/wiki/Embryonic_stem_cell
http://www.sciencemag.org/content/282/5391/1145.full
http://www.bio-rad.com/zh-cn/applications-technologies/isolation-maintenance-stem-cells
http://www.sciencedaily.com/articles/a/adult_stem_cell.htm
http://stemcell.childrenshospital.org/about-stem-cells/adult-somatic-stem-cells-101/
http://en.wikipedia.org/wiki/Adult_stem_cell
http://stemcellfoundation.ca/en/about-stem-cells/what-is-a-stem-cell/
http://www.explorestemcells.co.uk/historystemcellresearch.html
http://stemcells.nih.gov/info/scireport/pages/chapter3.aspx#Trounson1
http://biotechlearn.org.nz/themes/biotech_therapies/timeline_for_stem_cell_research
http://scienceprogress.org/2009/01/timeline-a-brief-history-of-stem-cell-research/
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2598267/
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http://www.eurostemcell.org/factsheet/alzheimer%E2%80%99s-disease-how-could-stem-cells-help
https://www.youtube.com/watch?v=fZRMYS3iFlo
http://en.wikipedia.org/wiki/Dementia
http://stemgenex.com/studies/alzheimers-stem-cell-studies/
http://www.livescience.com/26865-3d-printed-embryonic-stem-cells.html
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http://www.medicalnewstoday.com/articles/285069.php
http://alzheimers-review.blogspot.hk/2013/11/vascular-dementia-or-alzheimers-disease.html
http://en.wikipedia.org/wiki/Spleen
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https://www.corcell.com/blog/5-stem-cell-myths-debunked/
http://stemcellfoundation.ca/en/about-stem-cells/what-is-a-stem-cell/