Kharaa Bacterium

if the enzyme 42 can be found in every creature on the planet then why does the sample have to be from the sea King and not any other creature on the planet?

Appearance

The Carar manifests itself in yellow-orange cysts, along with similar coloured veins spread throughout it's host. These textures are temporary, and will be changed in the future, along with infected models of all the creatures.

Trivia

The way that Carar manifests itself is loosely based off the appearances of the Kharaa from Natural Selection 2, as the Kharaa have similar looking cysts on their body - a "secret" data-log further supports this by explicitly naming the Kharaa and the fight against them as happens in Natural Selection 2.
The texture of the Carar on the player will be limited only to the hands, since these are the only limbs visible.