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Any individual organism or molecule derived from 2 or more species.
An organism that results when an embryonic part of one organism is grafted onto another.

An organism with 2 or more cell lines, genotypes or karyotypes descended from at least 2 zygotes. Chimeras are very rare, only occur in twins and result from chorionic vascular anastomoses, transplantations or double fertilisations and subsequent participation of both fertilised meiotic products in one developing embryo; all hermaphrodites should be karyotyped to evaluate possible chimerism.

Molecular biology
(1) An animal formed from two different embryonic sources. In mouse genetics, targeted mutations produced in embryonic stem cells are recovered by breeding chimeric mice, resulting from the mixture of embryonic stem cells with a genetically distinct blastocyst.
(2) A clone containing genomic DNA from nonadjacent genomic segments or cDNA from two different mRNAs.

The term chimera was once used for a person who had received transplanted tissue—e.g., bone marrow surviving in a recipient.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.


  1. (also called graft-hybrid) an organism, usually a cultivated plant, whose tissues are of more than one genetical type as a result of mutation or grafting.
  2. a smooth-skinned cartilaginous deep-sea fish (‘king of the herrings’) of the subclass Holocephali, which were common in the Jurassic.
  3. a DNA hybrid molecule: a composite DNA molecule produced by GENETIC ENGINEERING, made up of DNA fragments from more than one organism. It is named after the Chimaera of Greek mythology, a beast with the head of a lion, the body of a goat and the tail of a serpent.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
chimaera infection had been identified, defined as isolation of culture-positive nontuberculous mycobacterium from an invasive nonpulmonary specimen, with M.
Based in Malta, Chimaera has been a leader in blockchain technology and innovation since 2013.
chimaera has been previously described following cardiac surgery (range of 5 to 40 months to diagnosis after surgery) as vascular graft infection, prosthetic valve endocarditis, or myocarditis [2, 3].
Jhun et al., "Clinical characteristics and treatment outcomes of pulmonary disease caused by Mycobacterium chimaera," Diagnostic Microbiology and Infectious Disease, vol.
Even the older guys that are 50, 60 years old, they've seen maybe one in their lifetime so they thought it was pretty neat and I snapped a couple pictures." The chimaera weighed between two and five kilograms, but was already dead when it was pulled from the net.
According to the findings, sharks, rays and chimaeras are at a substantially higher risk than most other groups of animals and have the lowest percentage of species considered safe with only 23% categorized as Least Concern.
Kao, "The Chimaera Reconfigurable Functional Unit," IEEE Transactions on Very Large Scale Integration (VLSI) Systems, vol.
The departure of imaginative children's literature in America from its derivative, didactic national antecedents is nowhere more apparent than in a scene from "The Chimaera," the last story in Hawthorne's best-selling juvenile collection, A Wonder Book for Girls and Boys (1852), simultaneously one of the first adaptations in English of classical myths for children, and a pioneer in children's Gothic.
It is also producing a new Sagaris, Tuscan convertible, Tuscan MK II, Cerbera, Chimaera and Griffith models, again at 'fixed price' with a new 6.2-litre 426 bhp 420lb/ft V8 engine.
MAJESTIC MOTORS: Gary Evans brought along his Rolls Royce Silver Shadow Mk1 (above) and (left) Dave and Brad Baldwin with their Chimaera REVVED UP: Rugby restauranteur Adrian Waller (above) brought along his Shelby GT 350 and (above right) Tom and Ros Commander in their Bentley Special 1948.
On "Chimaera," for instance, Hughes unspools the various meanings of the title, pointing out how it evokes decadence, a perverse imagination, and lesbian desire, but how it also "expressed the speaker's unending desire for mystery, for the unknown" (p.