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But consider them as a replacement for rice/wheat and it makes a lot more sense. I'm not a vego wanker. 
And on a technical point, the uptake of all protein is relative, people pretend this is only applied to vegetable protein.
People who don't get enough fibre don't absorb protein or anything else very well, and a high vitamin c uptake increases vegetable protein uptake considerably. So in all seriousness with beans and lime juice you're not even doing badly and dollar for dollar there's no contest at all.