"Hela" . . "HeLa CCL-2" . . . . . . . . "HeLa" . . . . . . . "HeLa cells" . . "HeLa#New species proposal" . "HeLa RBC007" . "hela cells" . . . "HeLa cell" . . . "HEp-2" . . "HeLa cell line" . . "HeLa" . . "HeLa cell lines" .