Marker 389 is a special marker because we can test it in two parts, both of which are very useful for genealogy. The first test looks at the first part of marker 389, and we call the marker tested 389-1. The second test looks at the entire marker, including the first section. In order to find out the results for the second half of the marker by itself, we must subtract the result for the first half from the result of the whole marker.
There are two ways to display the result of the second test on marker 389. In both cases, the name for the marker is 389-2. The first way to display the result is by showing the result from the original test, which is the total for the entire 389 marker, including the first section. This is how Family Tree DNA displays the result.
The second way is to show the result only for the second section that is tested by subtracting the 389-1 score from the original second test score. This is how the Genographic Project displays the result.
Basically, converting between the two is easy: simply add together the two 389 values from the Genographic Project to get the 389-2 value for Family Tree DNA, or subtract the 389-1 value from 389-2 from the Family Tree DNA results in order to get the 389-2 value for the Genographic Project.
Here are a few examples:
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