substitute
non-vector system means a system in which donor nucleic acid is or was introduced into a host cell—
(a) in the absence of a nucleic acid-based vector; or
(b) using a nucleic acid-based vector in the course of a previous dealing and the vector is—
(i) no longer present; or
(ii) present but cannot be remobilised from a host cell.
Examples
1 A system mentioned in par (a) might involve the use of electroporation or particle bombardment.
2 A system mentioned in par (b) might involve cells that were transduced with a replication defective retroviral vector in which no vector particles remain.