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Lee A, Fischer RS, Fowler VM.Lee A, et al. Among authors: fowler vm.Dev Dyn. 2000 Mar;217(3):257-70. doi: 10.1002/(SICI)1097-0177(200003)217:3<257::AID-DVDY4>3.0.CO;2-5.Dev Dyn. 2000.PMID: 10741420Free article.
Castillo A, Nowak R, Littlefield KP, Fowler VM, Littlefield RS.Castillo A, et al. Among authors: fowler vm.Biophys J. 2009 Mar 4;96(5):1856-65. doi: 10.1016/j.bpj.2008.10.053.Biophys J. 2009.PMID: 19254544Free PMC article.