The U.S. National Stem Cell Bank says it now has all 21 lines of embryonic stem cells approved for use in federally funded research.

The Madison based bank says it recently received deposits of the last two cell lines from Cellartis AB, a biotechnology company based in Sweden.

The National Institutes of Health established the bank at the WiCell Research Institute in 2005 to obtain, study and distribute the 21 lines to researchers. All six providers of those lines were invited to deposit their cells into the bank after it was established.

Derek Hei, a UW-Madison researcher who leads the bank, says the addition of the Cellartis lines is extremely important because they will now be widely available for research.