This is a pretty substantial article from a large number of authors working in a variety of taxonomic groups regarding the proper presentation of data when looking at historical patterns in paleontology and geology. This is a must read for anyone using fossils to calibrate anything.
Parham, J. F., et al. 2012. Best practices for justifying fossil calibrations. Systematic Biology. doi: 10.1093/sysbio/syr107 [open access].
Does expression of the toxA operon depend on ToxT as well as ToxA?
1 day ago in RRResearch