[Solved] An injection of "naked" DNA into muscle cells to induce an immune response against the proteins encoded by the DNA is an example of a subunit vaccine. Psychoanalytic: Pertaining to the theory and therapy developed by Sigmund Freud, which focuses on unconscious motivations and conflicts as drivers of human behavior. Between-Family Difference: Variation in characteristics, such as socio-economic status, values, practices, etc., observed between different families. Child-Rearing Attitudes: The beliefs, practices, and behaviors adopted by parents and guardians in the upbringing of children. Socioeconomic Status: A combined measure of an individual's or family’s economic and social position relative to others, based on income, education, and occupation.