If you click on the image to the left you’ll see a slightly annotated version of the computer printout for the DNA on the bra-clasp, taken from the review of DNA evidence in the appeal of Amanda Knox and Raffaele Sollecito.
Firstly, I’ve added coloured dots to show the position of alleles relating to Sollecito and to Meredith Kercher.
It should be noted, though, that, while Kercher’s full DNA profile is known, Sollecito’s is not. It is possible to partly work it out, because the review contains details relating to the mixed Kercher/Sollecito sample. According to the Massei report, this sample yielded a match to Sollecito across all 16 of the loci (groups of alleles) tested. Given this knowledge, we can subtract Kercher’s profile from the profile of the mixture, which leaves us with alleles relating to Sollecito.
However, some of Sollecito’s alleles overlap with Kercher’s. I’ve marked these on the image with pale blue dots. It’s unfortunately not possible to be sure which of these are genuine Sollecito alleles, but I’ve also added orange dots for alleles which are common in south Asia and rare in white Europeans (because Kercher’s mother is South Asian, it is likely that these are Kercher’s alleles but not Sollecito’s).
Sorry if anyone’s disappointed not to see a definite Sollecito profile there, but you can console yourself with the knowledge that the probably only reason this would be useful would be for checking the DNA profile on the bra-clasp. And, since using a DNA profile based on the bra-clasp testing in order to check the bra-clasp testing would be a bit circular, you’re not really missing out on much.
Marked with a figure 1 on the image are the peaks which Conti and Vecchiotto, authors of the DNA review, suggest ought to not to be rejected as “stutters” (a type of noise) but instead considered as potentially genuine alleles. I’ll examine this issue further in another post. But, to cut a long story short, Conti and Vecchiotto follow a recommendation in this report that peaks should not be rejected as stutters if they are both over 50 RFU in height and also over 15% of the height of the next known allele to their right.
Hope you like my dots. Just to warn you: for my next trick I propose to add green dots representing the DNA profile of Amanda Knox.