I am studying the methylation status of APC gene in colorectal patients. My practical approach starts with bisulfite conversion of DNA and then amplification using methylation specific PCR. Unfortunately, I am facing nonspecific binding(picture below). I tried to manipulate the PCR  conditions but nothing works. Lastly, I decided to change the primer pairs. So, could you recommend a data base that would enable me to check methylation specific primers.

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