Cells do not use the energy from oxidation reactions as soon as it is released. Instead, they convert it into small, energy-rich molecules such as ATP and nicotinamide adenine dinucleotide (NADH), which can be used throughout the cell to power metabolism and construct new cellular components.
Another difference is that deer antlers are branched and antelope horns are not. Antelopes belong to family Bovidae (as do sheep, goat and cattle), while deer belong to family Cervidae. Both are even-toed ungulates (hoofed animals) and ruminant mammals.
The size and shape of antelope horns varies greatly. Some groups, especially dwarf antelopes, have spikes. Other groups have twisted, spiral, curved, lyrate, or long horns. Many species also have ridges in their horns. All male deer have antlers; only Chinese water deer have tusks. In some species a female will have a small stub. The only female deer with antlers are reindeer. The antlers consist of vascular spongy tissue covered with a skin called velvet. The skin falls off after the antlers mature and become hard bone.