Peptide mass fingerprinting was performed on a Bruker Reflex IV MALDI-TOF mass spectrometer. Recombinant annexin A7 was purified according to [27], F-actin-binding of recombinant annexin A7 was done as described [28]. SDS-PAGE and western blotting were done as described [29,30]. Detection in immunoblots was with enhanced chemiluminescence [17]. Antibodies employed were mab 203–217 directed against mouse annexin A7 core domain [5] and a polyclonal rabbit anti-sorcin antibody [31].