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.
What is Collagen? Collagen is the largest and most abundant protein in the body, making up about 30 to 35% of the total protein. Collagen is in every tissue of the body and is the connective tissue in structures such as skin, hair, nails, bones, lungs, heart and liver. It is often referred to as the glue that holds the body together. Collagen contains glycine, proline, and hydroxyproline, the three amino acids the body uses to manufacture its own collagen.