I missed this one with the move and never ending sickness 3 (now 4? eeeek!) year olds create when they climb all over each other in "class" and big open gyms.
Thankfully it came up during the new US HUPO sponsored podcast mini-series "The Undergrad Expo" which highlighted shockingly capable undergraduates (which you might have gotten from context clues) and their research.
If you want an intro, Noah Earls is the guy who brought it up and his podcast is a cool 30 short listen. My understanding is that there are 3 main isoforms of ApoE and one is good, one is neutral and one is really really bad. This team took mice with each isoform and deuterium labeled them (!!) and did biochemistry at a massive scale. For people who do ApoE research, I suspect the well curated Excel tables in the supplemental are going to be a really useful resource.