# The Human Fertilisation and Embryology (Mitochondrial Donation) Regulations 2015, Regulation 4: Permitted egg: process


(1) The process referred to in regulation 3(a) consists of the following two steps.
(2) In step 1—
(a) either—
(i) all the nuclear DNA of an egg (“egg A”) is removed, or
(ii) all the nuclear DNA of egg A other than polar body nuclear DNA is removed; and
(b) either—
(i) all the nuclear DNA of another egg (“egg B”) is removed, or
(ii) all the nuclear DNA of egg B other than polar body nuclear DNA is removed.
(3) In step 2 all the nuclear DNA of egg B which is not polar body nuclear DNA is inserted into egg A.

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Source: https://www.legislation.gov.uk/ukdsi/2015/9780111125816/regulation/4 (the official version)
Page: https://openlegislation.uk/draft-human-fertilisation-and-embryology-mitochondrial-donation-regulations-2015/regulation-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.