title: Nuclear sheets in the egg of a fern, Dryopteris filix-mas.
mesh_terms: D001345:Autoradiography; D002462:Cell Membrane; D002467:Cell Nucleus; D002843:Chromatin / Q000032:analysis; D003594:Cytoplasmic Granules; D003720:Densitometry; D003851:Deoxyribonucleases; D005260:Female; D008854:Microscopy, Electron; D010063:Ovum / Q000166:cytology*; D059828:Plant Cells; D011402:Pronase; D012313:RNA / Q000032:analysis; D012260:Ribonucleases; D012639:Seeds; D013936:Thymidine / Q000378:metabolism; D014316:Tritium; D014357:Trypsin
chemical_list: D002843:Chromatin; D014316:Tritium; D012313:RNA; D003851:Deoxyribonucleases; D012260:Ribonucleases; D014357:Trypsin; D011402:Pronase; D013936:Thymidine