identical twins

synonym: monozygotic twins
https://doi.org/10.1351/goldbook.10836
Twins resulting from one zygote that, at an early stage of embryonic development, separated into two independently growing cell aggregations giving rise to two individuals of the same sex and identical genetic constitution.
Source:
PAC, 2016, 88, 713. (Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)) on page 767 [Terms] [Paper]