Specific antibodies directed against the different molecules analyzed in this study were obtained from several commercial and noncommercial sources as detailed herein. Monoclonal anti-TEX101 was generously provided by Dr. Yoshihiko Araki from Yamagata University (Yamagata, Japan). Dr. John Wilson from Michigan State University (East Lansing, MI) contributed the rabbit anti-HK1. Polyclonal anti-IZUMO was a gift from Dr. Masaru Okabe at Osaka University (Osaka, Japan). A specific polyclonal antiserum recognizing SPAM1 was obtained from Dr. Diana Myles and Dr. Paul Primakoff at the University of California, Davis. The antibody recognizing SLC2A3 was purchased from Alpha Diagnostic International. Dr. Kenji Kadomatsu from Nagoya University (Nagoya, Japan) generously provided the anti-BSG. Monoclonal antibodies reacting against FLOT1 and FLOT2 were purchased from BD Biosciences. Anti-CAV2 was obtained from Santa Cruz Biotechnology Inc. The monoclonal IgM that specifically recognizes the ganglioside GM3 was purchased from Seikagaku Corporation. Dr. Lonny Levin and Dr. Jochen Buck from the Department of Pharmacology, Weill Medical College of Cornell University (New York, NY) provided the antibody R2, which reacts against bicarbonate-dependent cyclase (ADCY10).