The best example is probably histones. There is lots of variety within proteins though. if you look at a specific protein in 2 different species, even if the two proteins do the same job, they may be mostly different.
Some proteins will be found in most mammals, with high 'sequence identity' like those related to muscles (e.g. titin, actin and mysosin) or cell cytoskeleton (e.g. tubulin) but histones tend to be well conserved among all eukaryotes (all things with nuclei) from amoebas to blue whales or c. elegans to humans, with only one or two amino acids different.
There is no protein that all animals have in common. Remember that "animal" includes everything from an eel to an elephant - there is such a wide variation between all the different animals that no single protein would be present in every one.
Genitals
Cologyn is another way of spelling collagen, which is the protein that makes up the connective tissue in animals. It makes up about 25% of all of the protein that an animal contains.
No. Like all animals, snakes are heterotrophs.
Protiens gained through Animals.
Regardless of size, all animals have the ability to reproduce by some means. They also all have cells that are surrounded by an aqueous environment
animals all animals (meats) have protein, some plants have protein too, like peanuts.
Meat and milk and protein
It's a peptide. It's not necessarily the same peptide for every person, and certainly not for every type of animal (if it were, anyone who was allergic to dogs would also be allergic to cats, rats, bears, monkeys and probably people). But if there is a protein common to the dogs and the cats and say, horses too, then a person allergic to that protein all these animals have in common could have an allergic reaction to all these animals.
Yes, all animals carry protein in their bodies.
They are all animals
All animals have to go throw pregnancy first which is common in all female animals.
All animals need protein because their bodies use the protein to produce energy. Without protein, animals would not be able to create the cellular reactions that sustain life.
All animals need protein, and amino acids are the building blocks of protein.
They all eat have eyes or
Deserts occur on all seven continents and there are no animals common to all.
2 common animals are the raccoon and the bear
protein