TABLE 2.

Cellular cloning of the mNDK-infected HeLa and SW480 populations: coculture analysis of cell clone entry phenotype

Syncytium formationa		No. of clonesb
HeLaCD4LTRLacZ	HeLaLTRLacZ	HeLa	SW480
−	−	45	4
+	±	28	11
++	±	15	0
+++	++	22c	0
++++	+++	6c	1

^aSyncytia were scored as follows: −, <5; ±, 5 to 10; +, 10 to 50; ++, 50 to 200; +++, 200 to 1,000; and ++++, >1,000. 

^bIndependent clones were recovered by using glass cylinders. 

^cTwenty-eight clones, from which clones 2, 14, and 48 were selected.