Columbia subject headings:
Cell interaction--Congresses.
Vitamin A--Metabolism--Congresses.
Vitamin A--Physiological effect--Congresses.
Harvard subject headings:
Cell interaction--Congresses.
Retinoids--Congresses.
Vitamin A--Metabolism--Congresses.
Vitamin A--Physiological effect--Congresses.
Princeton subject headings:
Cell interaction--Congresses.
Retinoids--Congresses.
Vitamin A--Metabolism--Congresses.
Vitamin A--Physiological effect--Congresses.