Please answer a question about the following article about Heian period:

The In-no-cho filled the void left by the decline of Fujiwara power. Rather than being banished, the Fujiwara were mostly retained in their old positions of civil dictator and minister of the center while being bypassed in decision making. In time, many of the Fujiwara were replaced, mostly by members of the rising Minamoto family. While the Fujiwara fell into disputes among themselves and formed northern and southern factions, the insei system allowed the paternal line of the imperial family to gain influence over the throne. The period from 1086 to 1156 was the age of supremacy of the In-no-cho and of the rise of the military class throughout the country. Military might rather than civil authority dominated the government.

The members of what clan gradually replaced the Fujiwaras?
Minamoto