Antibodies used for immunoblot and immunofluorescence analysis were obtained from the following sources: mouse anti–dynamin 1/2 and mouse anti–dynamin 2 were from BD; rabbit anti–dynamin 2 was described previously (Ferguson et al., 2009 (link)); mouse anti–DC-STAMP, mouse anti-actin, mouse anti–cathepsin K, and rabbit anti–integrin β3 were from EMD Millipore; rabbit anti-Src and mouse anti-NFATc1 were from Santa Cruz Biotechnology, Inc.; mouse anti-vinculin was from Sigma-Aldrich; rabbit anti-CHC was from Abcam; anti–mouse and anti–rabbit IgG-HRP conjugates were from Promega; and Alexa Fluor 488– and 546–conjugated secondary antibodies were from Invitrogen.