Preface, Thomas Dittmar, Kurt S. Zänker; 1 Introduction, Thomas Dittmar, Kurt S. Zänker; 2 Heterochronic control of AFF-1-mediated cell-to-cell fusion in C. Elegans, Lilach Friedlander-Shani, Benjamin Podbilewicz; 3 Role of SNAREs in membrane fusion, Bahnu P. Jena; 4 Molecular and cellular mechanisms of mammalian cell fusion, Xiaofeng Zhou, Jeffrey L. Platt; 5 Membrane fusions during mammalian fertilization, B.M. Gadella, Janice P. Evans; 6 Trophoblast fusion, Berthold Huppertz, Martin Gauster; 7 Macrophage fusion and multinucleated giant cells of inflammation, Amy K. McNally, James M. Anderson; 8 Molecular mechanisms of myoblast fusion across species, Adriana Simionescu, Grace K. Pavlath; 9 Cell-fusion-mediated reprogramming: Pluripotency of transdifferentiation? Implications for regenerative medicine, Daniela Sanges, Frederic Lluis, Maria Pia Cosma; 10 Cell fusion and tissue regeneration, Manuel Álvarez-Dolado, Magdalena Martínez-Losa; 11 Dendritic cell-tumour cell fusion vaccines, Walter T. Lee; Index