There are slight differences in the meanings of these terms, but they are often used interchangeably. 1  Independent Variable: It implies causality: the independent variable affects the dependent variable. 2  Used predominantly in ANOVA, but often in regression as well. 3  It can be either continuous or categorical.
Protein Quality. Collagen is not a complete protein because it is lacking in the amino acid tryptophan. A Protein Digestibility Corrected Amino Acid Score (PDCAA) of a complete protein is 1.0.ollagen is a protein found in the muscle and connective tissue of animals. Hydrolyzed collagen protein supplements are typically made from the bones and skin of cows, horses or pigs.
1 Collagen is the most abundant structural protein in the body. 2  It represents about 70% of the body connection tissue and is necessary for the creation of skin, muscle, bone and cartilage.3  This protein has a recognized position as functional ingredient thanks to its well known and identified health promoting properties. Collagen is the glue that holds the body together. 2  It is the most abundant structural protein in the body 60% of the body is made up of connective tissue and collagen represents 80% of all connective tissue.