Human Umbilical Cord Blood-Derived Mesenchymal Stem Cells Contribute to Chondrogenesis in Coculture with Chondrocytes

Table 1

The seeding cell number of human articular chondrocytes (hACs) and human umbilical cord blood-derived mesenchymal stem cell (hUCB-MSCs).

	Group	hUCB-MSCs (cells/cm^2)	hACs (cells/cm^2)
a	hACs	—	0.6 × 10^4
b	hUCB-MSCs	0.6 × 10^4	—
c	hUCB-MSCs cultured with growth factors	0.6 × 10^4	—
d	Direct coculture (1 : 1)	0.3 × 10^4	0.3 × 10^4
e	Direct coculture (3 : 1)	0.45 × 10^4	0.15 × 10^4
f	Direct coculture (5 : 1)	0.5 × 10^4	0.1 × 10^4
g	Indirect coculture	0.6 × 10^4	—
h	Indirect coculture	—	0.6 × 10^4