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covs have a proof-reading exoribonuclease, deletion of which results in exceedingly high mutability and attenuation or even inviability.
ang mga cov ay mayroong isang proof-reading na exoribonuclease, ang pagtanggal ay nagreresulta sa labis na mataas na kakayanang magmutasyon at mapahina o maging mawalan ng saysay.
