Summary: BRCA1 promotes homologous recombination (HR) by activating DNA-end resection. By contrast. 53BP1 forms a barrier that inhibits DNA-end resection. Here. https://www.roneverhart.com/Toshiba-AL13SX-AL13SXB30EN-300GB-15K-RPM-SAS-12Gb-s-512n-128MB-2-5-Hard-Drive/