▁involved ▁in ▁defense ▁against ▁simple ▁e uk ary otic ▁pred ators ▁and ▁in ▁inter - b acter ia ▁interactions . ▁The ▁gene ▁for ▁T 6 SS ▁form ▁a ▁gene ▁cluster ▁that ▁consists ▁of ▁more ▁than ▁ 1 5 ▁gen es . ▁H cp ▁and ▁V gr G ▁gen es ▁are ▁the ▁most ▁universal ▁gen es . ▁Struct ural ▁similarity ▁of ▁T 6 SS ▁with ▁the ▁tail ▁sp ike ▁of ▁the ▁T 4 ▁ph age ▁suggest ▁that ▁the ▁process ▁of ▁in fection ▁is ▁similar ▁to ▁that ▁of ▁the ▁ph age . ▁ ▁Type ▁VII ▁▁ ▁Type ▁VII ▁secret ion ▁system ▁( T 7 SS ) ▁is ▁present ▁in ▁Gram - pos itive ▁b acter ia ▁and ▁My c ob acter ia ▁such ▁as ▁M . ▁t uber cul osis , ▁M . ▁b ovis , ▁Stre pt omy ces ▁co el icol or ▁and ▁S . ▁a ure us . ▁It ▁is ▁also ▁called ▁T 7 b ▁system ▁in ▁Bac ill us ▁sub til is ▁and ▁S . ▁a ure us . ▁It ▁is ▁composed ▁of ▁two ▁basic ▁components : ▁a ▁memb rane - bound ▁hex amer ic ▁ATP ase ▁that ▁is ▁member ▁of ▁the ▁F ts K / S po III E ▁protein ▁family , ▁and ▁any ▁one ▁of ▁the ▁Es x A / Es x B - related ▁protein ▁such ▁as ▁Es a A , ▁Es a D , ▁Es x B , ▁Es x D , ▁as ▁well ▁as ▁Ess ▁system ▁( E ss A , ▁Ess B , ▁and ▁Es