There are 3 key allergens associated with lentil allergies.
Len c 1 is a gamma vicilin unit protein. This links the protein in lentils to other legumes, nuts and seeds that contain vicilin like proteins. Len c 3 is a lipid transfer protein (LTP).
I have put together some more comprehensive resources at http://www.allergyresources.co.uk/Lentil.php
The allergy resources page for lentils covers the key allergens, which allergic syndromes are linked to this allergy and other foods which are commonly cross reactive with lentils .
There is also regularly updated links to useful websites specifically for lentil allergies and the latest research papers on the topic.
If you have multiple allergies and are interested in how they are linked or want to find out more about food allergies outside the usual top 14 then you can follow me on Facebook or Twitter, where I share a food allergy card every day of the week.