ﻫﻲ ﻧﺼﻒ ﺍﻟﻜﻤﻴـﺔ ﰲ ﺩﺍﺭﺉ ﺍﻟﺒـﻮﺭﺍﺕ TBE ﻭﻟﻪ ﺳﻌﺔ ﺩﺍﺭﺋﺔ Buffering capacity ﺍﻗﻞ ﻭ ﻟﻜﻦ ﻳﻌﻄﻲ ﻧـﻮﺍﺗﺞ ﺃﻓﻀـﻞ ﻭﻳﺴـﺘﻌﻤﻞ ﺍﻟﺪﺍﺭﺉ ﰲ ﻋﻤﻠﻴﺔ ﲢﻀﲑ ﻫﻼﻡ ﺍﻻﻛﺎﺭﻭﺯ ﻭﻛﺬﻟﻚ ﰲ ﻋﻤﻠﻴﺔ ﺍﻟﺘﺮﺣﻴـﻞ ﺍﻟﻜﻬﺮﺑـﺎﺋﻲ Running buffer ﺍﻳﻮﻥ ﻣﻦ ﺍﳌﻨﻐﻨﻴﺰ ﻣﻦ ﺗﺰﻳﺪ ﺃﺧﻄﺎﺀ ﺇﻧﺰﳝﺎﺕ ﻛﻮﺛﺮﺓ DNA ﺍﻹﻧﺰﳝﺎﺕ ﺍﺗﻀﺢ ﻣﻦ ﻣﺴﺘﻬﻞ ﺍﳌﻮﺿﻮﻉ ﺍﻥ ﻋﻤﻠﻴﺔ ﺍﻟﻜـﻮﺛﺮﺓ ﻫـﻲ ﺗﻔﺎﻋـﻞ ﺇﻧﺰﳝـﻲ ﺑﺴـﻴﻂ ﳛـﺎﻛﻲ ﻣـﺎ ﳛﺼﻞ ﺩﺍﺧﻞ ﺍﻷﻧﻈﻤﺔ ﺍﳊﻴﺔ ﻭﺟﻮﻫﺮ ﺍﻟﺘﻔﺎﻋﻞ