Cover Caption

About the cover: Confocal microscopic images shown the difference between mFpr1 and mFpr2 in ligand-induced receptor internalization. EGFP-tagged mFpr1 and mFpr2 were expressed in HeLa cells, and stimulated with either fMLF, fMLFK or buffer controls. Both fMLFK and fMLF stimulated internalization of mFpr1. In contrast, only fMLFK but not fMLF stimulated internalization of mFpr2. Adapted from Figure 3 of He et al. (page 389 of this issue).