The paper "Surface Characterization of the Extracellular Matrix Remaining after Cell Detachment from a Thermoresponsive Polymer," H.E. Canavan, X. Cheng, D.J. Graham, B.D. Ratner and D.G. Castner, Langmuir, 21, 1949-1955, 2005. Please see http://pubs.acs.org/journals/langd5/index.html for further details.