20 picomoles = 1ul of 20uM primer 100 to 200bp 4ng 2 picomoles = 1ul of 2uM primer 200 to 500bp 10ng 2 picomoles = 1ul of 2uM primer 500 to 1000bp 20ng 2 picomoles = 1ul of 2uM primer 1000 to 2000bp ...