99Fourth, it is apparent from Article 21(1) and (3) of Regulation No 1107/2009 that the Commission may review the approval of an active substance at any time, including where, in the light of new scientific and technical knowledge, there are indications that the substance no longer satisfies the approval criteria laid down in Article 4 of that regulation. Likewise, it follows from Article 44(1) and (3) of that regulation that the authorisation of a plant protection product may be reviewed, then amended or withdrawn, where, inter alia, it is apparent from developments in scientific and technical knowledge that the product does not satisfy or no longer satisfies the requirements for a marketing authorisation laid down in Article 29 of that regulation, including the requirement that it has no immediate or delayed harmful effect on human health.
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