Table 6.

The top 20 keywords.

Rank	Keyword	Occurrences	Total link strength	Rank	Keyword	Occurrences	Total link strength
1	mesenchymal stem cells	987	916	11	inflammation	91	83
2	liver fibrosis	288	267	12	hepatocyte	86	85
3	stem cell	244	219	13	regenerative medicine	80	76
4	exosomes	179	166	14	acute liver failure	74	70
5	differentiation	137	126	15	cell transplantation	69	66
6	liver	113	111	16	tissue engineering	68	67
7	cell therapy	109	104	17	hepatocytes	64	60
8	liver regeneration	107	96	18	liver diseases	64	64
9	transplantation	103	93	19	bone marrow	61	61
10	immune tolerance	98	91	20	apoptosis	56	54