▁can ▁also ▁be ▁seen ▁using ▁Wright - st ained ▁blood ▁sm ears . ▁ ▁References ▁ ▁Further ▁reading ▁ ▁External ▁links ▁▁ ▁Bor rel ia ▁genom es ▁and ▁related ▁information ▁at ▁▁ ▁P AT R IC , ▁a ▁Bio in format ics ▁Resource ▁Center ▁fund ed ▁by ▁▁ ▁N IA ID ▁Bor rel ia ▁Micro be ▁Wik i ▁Page ▁NC BI ▁Bor rel ia ▁Tax onomy ▁Browser ▁ ▁Category : L yme ▁disease ▁Category : S pi ro cha etes ▁Category : B acter ia ▁gener a <0x0A> </s> ▁An ▁o ven ▁is ▁a ▁therm ally ▁ins ulated ▁chamber ▁used ▁for ▁the ▁he ating , ▁b aking , ▁or ▁dry ing ▁of ▁a ▁subst ance , ▁and ▁most ▁commonly ▁used ▁for ▁cook ing . ▁Kil ns ▁and ▁furn aces ▁are ▁special - pur pose ▁o vens ▁used ▁in ▁pot tery ▁and ▁metal working , ▁respectively . ▁ ▁History ▁ ▁The ▁earliest ▁o vens ▁were ▁found ▁in ▁Central ▁Europe , ▁and ▁date ▁back ▁to ▁ 2 9 , 0 0 0 ▁BC . ▁They ▁were ▁ro ast ing ▁and ▁bo iling ▁p its ▁inside ▁y ur ts ▁used ▁to ▁cook ▁m amm oth . ▁In ▁Ukraine ▁from ▁ 2 0 , 0 0 0 ▁BC ▁they ▁used ▁p its ▁with ▁hot ▁co als ▁covered ▁in ▁as hes . ▁The ▁food ▁was ▁wrapped ▁in ▁leaves ▁and ▁set ▁on ▁top , ▁then ▁covered ▁with ▁earth . ▁In ▁cam ps ▁found ▁in ▁Me zh ir ich , ▁each ▁m amm oth ▁b one ▁house ▁had ▁a ▁hear