Is anyone familiar with cell lines for studying hematopoietic activity?

No, but here are some links.

http://phys.org/news/2016-04-scientists-uncover-rare-life-saving-blood.html

https://www.theguardian.com/technology/2014/dec/10/20-innovations-blood-grown-stem-cells-transfusions

http://www.cell.com/cell/abstract/S0092-8674%2814%2900472-3

https://wellcome.ac.uk/press-release/first-volunteers-receive-blood-cultured-stem-cells-2016

http://www.jove.com/about/press-releases/48/novel-technique-to-produce-stem-cells-from-peripheral-blood

https://news.upenn.edu/news/researchers-penn-uncover-mechanism-behind-blood-stem-cells-longevity

http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0053161

http://phys.org/news/2012-11-technique-stem-cells-peripheral-blood.html

http://medicalxpress.com/news/2012-01-blood-forming-stem-cells-growth.html

http://www.eurekalert.org/pub_releases/2011-09/asoh-rsp090111.php

http://www.eurekalert.org/pub_releases/2011-09/sifm-sss090611.php

http://medicalxpress.com/news/2011-08-breakthrough-isolates-human-blood-stem.html

http://medicalxpress.com/news/2011-07-pure-human-blood-stem-cell-discovery.html

http://medicalxpress.com/news/2012-01-redraws-blood-cell-production.html

http://onlinelibrary.wiley.com/doi/10.1111/j.1537-2995.2010.02644.x/abstract

http://www.eurekalert.org/pub_releases/2008-12/uom-brc122208.php

https://www.newscientist.com/article/dn14565-first-red-blood-cells-grown-in-the-lab/

http://www.news-medical.net/news/2008/02/17/35295.aspx

https://www.sciencedaily.com/releases/2006/09/060903150808.htm

Regards,

Joachim