Your friend is correct. There are actually 8 different blood types all together. The best way for you to obtain a list and more information about all the blood types, would be to contact the American Red Cross.
If you are looking for more infomration on Where can I find a list of rare blood types, the best place to look for the infomration is on www.rarebloodtypes.org/list-chart.php
A list of blood types is something you will see in 4 diffrent types but yet there is a total of 8 diffrent groups with the RH + and - counts. to get a list go to this web site http://www.drlam.com/blood_type_diet/ and you can get a graph to teach with.
If you can not find a chart online almost every local medical clinic will have a chart or all the blood types and more than enough information to give you the full listings of blood types.
There are several sites online that provide listings for blood type diets with specific food lists available. These sites often use words such as "blood type diet' or 'blood type diet lists' and show the specific food list categories for Type O, Type A, Type B, and Type AB blood.
A very reliable website that offers good factual information about blood types is the red cross. Their site can be found at: http://www.redcrossblood.org/learn-about-blood/blood-types.
AB Negative is the most rare of the 8 blood types. The full list of types is A, B, Ab,and O. Within that group there are both positive and negative groupings.
The Blood Type Diet plan can be found on Dr. Peter D'Adamo's website, http://www.dadamo.com/. This website has lists of foods and supplements for people with various blood types, including Type B.
Although most blood type diets are similar, individual blood types may respond more significantly to certain types of foods. Type O blood types should focus on high protein meats, lean chicken, and large servings of vegetables, although most grains should be avoided.
You can find a list of blood type rarity on the American Red Cross website, as well as a wealth of good information on the subject of blood typing.There seems to be a higher occurance rate of positive blood types as opposed to negative blood types, but that does not necessarily mean that they are rare. The rarest blood type, though, is AB negative.
Information is readily available for food lists for people with blood type A: The following provides additional information: www.livestrong.com/.../220033-a-beneficial-food-list-for-eating-righ
You could find a list of foods correlating with blood types with your local nutritionalist. These people are trained specifically to be able to tell you exactly what foods work best with what blood type.
Muscle cells,Skin cells, and white blood cells.