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. 2007 Feb 13;5(3):e43. doi: 10.1371/journal.pbio.0050043

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© 2007 Nadel et al.

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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ΨHJ and/or HJ (primer combination 1 + 4). Nucleotides in parenthesis are ambiguous and could be assigned to either side of the joint. See also legend to Figure 3.