CELL CYCLE, NBS1, FHA DOMAIN, BRCT DOMAIN, PHOSPHOPROTEIN BINDING, PHOSPHOSERINE BINDING, DNA REPAIR., CHROMOSOMAL PROTEIN, DNA DAMAGE, DNA REPAIR, NUCLEUS, PHOSPHOPROTEIN, TELOMERE, DNA BINDING PROTEIN 3HUE STRUCTURE OF THE S. POMBE NBS1 FHA-BRCT1-BRCT2 DOMAINS