(1) In regulation 3 of the Principal Regulations, for the definition of characterised substitute —
""characterised" means—
(a) in relation to a nucleic acid—the nucleic acid has been sequenced and there is an understanding of potential gene products or potential functions of the nucleic acid; or
(b) in relation to a genetic modification—the gene or genomic region which is modified has been sequenced and there is an understanding of—
(i) potential gene products or potential functions of the gene or genomic region; and
(ii) the likely effect of the genetic modification on the gene products or functions;".
(2) In regulation 3 of the Principal Regulations insert the following definition—
" host/vector system has a meaning affected by clause 2.1(3) of Schedule 2;".
(3) In regulation 3 of the Principal Regulations, for the definition of "non-vector system" substitute —
" non-vector system has the meaning given in Part 3 of Schedule 2;".
(4) In regulation 3 of the Principal Regulations, in the definition of "toxin producing organism", for "100 μg/kg" substitute "100 micrograms per kilogram".