Wyeast 1272 is Siebel Bry 97. Wyeast 1056 is Siebel Bry 96 (which was originally a Ballantine strain). Both strains are available in dry form. US-05 is Bry 96. Danstar Bry 97 is Siebel Bry 97. Lallemand owns the Siebel Institute of Technology. Bry 97 is a slow starter, but it produces a beautiful beer that is more malt forward than Bry 96. If using dry Bry 97, it is important to pitch at least 1 gram per liter (i.e., two packages in a 5-gallon batch).