Vitamin c is best known for its role in preventing scurvy. it also is critical in the formation and maintenance of this protein found in all connective tissues in our body.

Investigator a has biological specimens that are coded and linked to identifiers of the source individuals. investigator a provides the specimens to investigator b but does not provide the individual identifiers. investigator b agrees not to re-identify the source individuals. is investigator b's research using the biospecimens human subjects research according to the definition of human subjects research in the federal regulations?