Looking for specific protein ladder

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S.A.D.
S.A.D.'s picture
Looking for specific protein ladder

Hello,

I am currently dealing with 4 isoforms of a given protein, and their molecular weights are roughly 122, 130, 132, 137 kDa respectively.

Most of the standards/ ladders that I have come across usually have one marker at ~100kDa and then jump straight to either ~150kDa or ~200kDa, skipping my entire range of interest.

Anyone know of any size standards/ ladders available that will help resolve these isoforms for me in the range of about 120 to 140 kDa?

Thanks a lot