`` Transformation '' may also be used to describe the insertion of new genetic material into nonbacterial cells , including animal and plant cells ; however , because `` transformation '' has a special meaning in relation to animal cells , indicating progression to a cancerous state , the term should be avoided for animal cells when describing introduction of exogenous genetic material .
Transformation may also used to describe the insertion of new genetic material into nonbacterial cells , such as animal and plant cells .