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Chromosome duplication normally initiates via the assembly of replication fork complexes at defined origins. DNA synthesis by any one fork is thought to cease when it meets another travelling in the opposite direction, at which stage the replication machinery may simply dissociate before the nascent...
ORGANISM(S): Escherichia coli 
The germinal center (GC) is a microanatomical compartment wherein high-affinity antibody-producing B cells are selectively expanded. B cells proliferate and mutate their antibody genes in the dark zone (DZ) of the GC and are then selected by T cells in the light zone (LZ) on the basis of affinity. H...
ORGANISM(S): Mus musculus 
During S-phase of the eukaryotic cell cycle, controls exist to ensure that replication origins fire only once and become inactivated after traverse of a replication fork. Failure of these controls results in local amplification of the genome which can lead to gene copy increases important for both ...
ORGANISM(S): Schizosaccharomyces pombe 
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