How receptors bring proteins and particles into cells.
D000818:Animals; D002462:Cell Membrane / Q000502:physiology; D004705:Endocytosis; D006801:Humans; D010587:Phagocytosis; D011506:Proteins / Q000378:metabolism*; D051381:Rats; D011956:Receptors, Cell Surface / Q000378:metabolism; D011990:Receptors, Transferrin; D014168:Transferrin / Q000378:metabolism
D011506:Proteins; D011956:Receptors, Cell Surface; D011990:Receptors, Transferrin; D014168:Transferrin