sentence: Chimaeras are formed from at least two fertilized eggs or early embryos fused together.
sentences_before: If the different cells have come from the 'same' zygote, the organism is called a mosaic.
sentences_after: Each population of cells keeps its own character and the resulting organism is a mixture of tissues. Chimaeras are typically seen in animals.
concept_name: chimaera
headings: Chimaera (genetics)
categories: Developmental biology Biological reproduction