Living things ... including us.
hormones
Antibodies are protein-containing substances that play a crucial role in defense by recognizing and neutralizing harmful pathogens like bacteria and viruses. These proteins are produced by the immune system in response to foreign invaders to help protect the body from infections.
Collagen is a protein that plays a structural role in the body. It is the main component of connective tissue, providing strength and support to tissues such as skin, tendons, and bones.
hemoglobin
Hemoglobin is a blood protein containing iron.
Hemoglobin is a blood protein containing iron.
An iron-containing protein is called a heme protein, which includes hemoglobin and myoglobin. These proteins are crucial for transporting and storing oxygen in the body.
carrier protein
pro-protein
pro-protein
Antigens are protein substances formed in the blood to destroy foreign substances. Antigens can also be administered artificially in some cases.
protein channels aid the movement of substances into and out of the cell.