 comparison fine structur cultur mac-21 hela cell fine structur cultur mucoid adenocarcinoma cell human lung mac-21 describ compar fine structur hela cell differ fine structur strain quantit mac-21 cell differ respect spindl-shape cell larger nucleu increas nuclear membran invagin consider larger amount perinuclear golgi apparatu cytoplasm contain area low densiti undefin limit membran thought accumul mucin cell strain contain numer multivesicular bodi lamella stage develop suggest organel involv format lipid-rich myelin structur observ hela mac-21 cell number myelin bodi invers proport ph medium 