| proplast | Polymer of polytetrafluoroethylene and carbon filaments; porous biocompatible material used in orofacial and middle ear reconstruction and as coating for metal implants. (12 Dec 1998) |
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| proplastid | Small, colourless plastid precursor, capable of division. It can develop into a chloroplast or other form of plastid and has little internal structure. Found in cambial and other young cells. (18 Nov 1997) |