what chap did they say you needed the senju dna to get rinnegan?

[first sage hokage]

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[Simple Math]

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[choft]

Chapter 606. Read this manga scan:

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[BazzBee]

Chapter 604

 

[Uchiha Josephus]

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Beat me to it!

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[choft]

Chapter 604

Huh? Chapter 604 doesn't say anything in regards to what the OP is asking.

 

[avenged sevenfold]

I believe it is chapter 604-606