Ten-year-old myles has started growing much taller than the average height of a boy his age. myles' doctor confirms tumor growth in his pituitary gland. what is myles' diagnosis?

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?