title: Reply to Varma: Elucidation of the signal origin for label-free, free-solution interactions.
authors.affiliation: Department of Chemistry, Vanderbilt University, Nashville, TN 37235; Vanderbilt Institute for Chemical Biology, Vanderbilt University, Nashville, TN 37235; darryl.bornhop@vanderbilt.edu.
authors.forename: Darryl J
authors.initials: DJ
authors.lastname: Bornhop
authors.affiliation: Department of Chemistry, Vanderbilt University, Nashville, TN 37235; Vanderbilt Institute for Chemical Biology, Vanderbilt University, Nashville, TN 37235;
authors.forename: Michael N
authors.initials: MN
authors.lastname: Kammer
authors.affiliation: Department of Chemistry, Vanderbilt University, Nashville, TN 37235; Vanderbilt Institute for Chemical Biology, Vanderbilt University, Nashville, TN 37235;
authors.forename: Amanda
authors.initials: A
authors.lastname: Kussrow
authors.affiliation: Department of Chemistry, Lehigh University, Bethlehem, PA 18015.
authors.forename: Robert A
authors.initials: RA
authors.lastname: Flowers