import re
s = 'Q3U96 Mus musculu MRMP-mous Optimizatio "MRMP-mouse "'
res = re.sub(r'"[^"]+"', lambda m: m.group(0).replace("\t", ""), s)
print(res)
aW1wb3J0IHJlCnMgPSAnUTNVOTYJTXVzIG11c2N1bHUJTVJNUC1tb3VzCU9wdGltaXphdGlvCSJNUk1QLW1vdXNlCSInCnJlcyA9IHJlLnN1YihyJyJbXiJdKyInLCBsYW1iZGEgbTogbS5ncm91cCgwKS5yZXBsYWNlKCJcdCIsICIiKSwgcykKcHJpbnQocmVzKQ==