Also well known are dopamine and norepinephrine, which are made from tyrosine. Dopamine and norepinephrine help to keep us alert. Also, collagen, elastin, and fibrin. Globular proteins are round. Globulin helps to protect the body from infectious diseases.
Incomplete proteins are deficient in one or more essential amino acids.
P roteins containing all of the essential amino acids are considered superior in quality because of their ability to support the growth of baby animals. This superior nature is referred to as high biological value. When certain food sources of protein are consumed together they may compliment each other. The protein quality of the two foods combined may be superior to the quality of the protein in either individual food. In combination they compliment each other and provide protein of higher biological value.