The present invention relates to cell-regulatory proteins and to nucleotide sequences encoding said proteins wherein the proteins have been found to be potential tumor and/or senescense markers useful for medical diagnostics and additionally having therapeutical potential as well as antiapoptotic properties useful for improving cell viability in cell culture technology. The invention further relates to antibodies directed against the cell-regulatory proteins and to their use in medical diagnostics and therapy. The invention further relates to methods for the manufacture and application of the cell-regulatory proteins and of the corresponding nucleotide sequences.