os ome . ▁The ▁sites ▁are ▁designated ▁Ter A , ▁Ter B , ▁... , ▁Ter J . ▁Each ▁site ▁is ▁ 2 3 ▁base ▁pairs . ▁ ▁Function ▁A ▁DNA ▁rep lication ▁termin us ▁( ter ) ▁has ▁a ▁role ▁in ▁prevent ing ▁ ▁progress ▁of ▁the ▁DNA ▁rep lication ▁fork . ▁Therefore , ▁a ▁DNA ▁rep lication ▁termin us ▁site - binding ▁protein ▁bind s ▁to ▁this ▁site ▁helping ▁to ▁block ▁the ▁DNA ▁rep lication ▁fork . ▁There ▁are ▁two ▁gen es ▁cont rolling ▁ter - binding ▁activity , ▁named ▁t au ▁and ▁t us . ▁ ▁References ▁ ▁Category : Pro te in ▁families <0x0A> </s> ▁" S ail ing ▁By " ▁is ▁a ▁short ▁piece ▁of ▁light ▁music ▁composed ▁by ▁Ron ald ▁B inge ▁in ▁ 1 9 6 3 , ▁which ▁is ▁used ▁before ▁the ▁late ▁Sh ipping ▁Fore cast ▁on ▁BBC ▁Radio ▁ 4 . ▁A ▁slow ▁w alt z , ▁the ▁piece ▁uses ▁a ▁repet itive ▁ABC AB ▁structure ▁and ▁a ▁distinct ive ▁rising ▁and ▁falling ▁wood wind ▁ar p eg gio . ▁ ▁Context ▁and ▁usage ▁" S ail ing ▁By " ▁is ▁played ▁every ▁night ▁on ▁BBC ▁Radio ▁ 4 ▁at ▁around ▁ 0 0 : 4 5 hr s ▁before ▁the ▁late ▁Sh ipping ▁Fore cast . ▁Its ▁t une ▁is ▁repet itive , ▁assist ing ▁in ▁its ▁role ▁of ▁serving ▁as ▁a ▁signal ▁for ▁sail ors ▁tun ing ▁in ▁to ▁be ▁able ▁to ▁easily ▁identify ▁the ▁radio ▁station . ▁It ▁also ▁functions