PLoS One PLoS One FRET based quantification and screening technology platform for the interactions of Leukocyte Function-associated Antigen-1 (LFA-1) with InterCellular Adhesion Molecule-1 (ICAM-1) Chakraborty Sandeep Núñez David Hu Shih-Yang Domingo María Pilar Pardo Julian Universidad de Zaragoza Karmenyan Artashes Gálvez Eva M Chiou Arthur 2014 research-article