Exclusively: only, soly, to the exclusion of anyone or anything else.
Exclusively of protein: only of protein
--------
Exclusive: adj.
1.Excluding or tending to exclude: exclusive barriers.
2.Not allowing something else; incompatible: mutually exclusive conditions.
3.Not divided or shared with others: exclusive publishing rights.
4.Not accompanied by others; single or sole: your exclusive function.
5.Complete; undivided: gained their exclusive attention.
6.Not including the specified extremes or limits, but only the area between them: 20-25, exclusive; that is, 21, 22, 23 and 24.
7.Excluding some or most, as from membership or participation: an exclusive club.
8.Catering to a wealthy clientele; expensive: exclusive shops.
9.Linguistics. Of, relating to, or being a first person plural pronoun that excludes the addressee, such as we in the sentence Chris and I will be in town tomorrow, so we can stop by your office.
