| Bluetongue virus (5) |  |
| Flaviviruses (7) | |
| Influenza (18) | |
| Retrovirus (8) | |
| Rhabdovirus (6) | |
| Bluetongue virus (5) | |
| Flaviviruses (7) | |
| Influenza (18) | |
| Retrovirus (8) | |
| Rhabdovirus (6) | |
An additional genomic study then revealed the genetic cause of the blue colored eggshell#a surprisingly harmless ancient retrovirus in the domestic chicken.
A retrovirus is a virus that unlike most cellular organisms carries its genetic blueprint in the form of ribonucleic acid (RNA.
This makes it possible for genetic material from a retrovirus to become permanently incorporated into the DNA of an infected cell.
In this case the retrovirus effect was to trigger an accumulation of a green-blue bile pigment called biliverdin in the eggshell as the egg develops in the hen.
Unlikely odds#An unexpected find was the unique integration sites for the retrovirus in South american/European
and so the chance of a retrovirus integrating at more or less the same location in two chicken populations is extremely low.#
latent retrovirus fragments in their genomes, present in all their living cells, that are harmless to their native hosts
In some cases, the therapeutic copy is delivered by a retrovirus the plunks the new gene down near randomly in the patients genome,
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