I’ve only translated a portion of the Japanese document to read so I might be wrong, but I believe the study injected the vaccine (mRNA encapsulated in LNPs). So, the 50 ug should include the LNP weight.

About whether the % of administered dose includes the LNP, I’m not sure, honestly. But at least the professor specializing in brain drug biodistribution said that the % of administered dose is the correct number to look at, which also makes sense to me.