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a non-membrane bound structure made of proteins and nucleic acids that occurs within the nucleus of cells. Its function is to makes ribosomes within the nucleus.
a disease caused by the human immunodeficiency virus (HIV).
a ring of muscle that controls the passage of substances through a tube or body opening.
an area of land which is usually covered with shallow water, and which supports plants adapted...
consists of the pectoral and pelvic girdles together with the arms and legs.