telomere maintenance biological_process Reactome:R-HSA-157579 regulation of telomere length GO:0000723 Any process that contributes to the maintenance of proper telomeric length and structure by affecting and monitoring the activity of telomeric proteins, the length of telomeric DNA and the replication and repair of the DNA. These processes includes those that shorten, lengthen, replicate and repair the telomeric DNA sequences. DNA metabolic process telomere organization