Given a passage with a question and an answer to that question, classify if the answer actually answers the question into 'yes' or 'no'. Output 'yes' if the answer answers the question and output 'no' if the answer does not answer the question.

Question: Does in vivo treatment with granulocyte colony-stimulating factor delay apoptosis in human neutrophils by increasing the expression of the vacuolar proton ATPase?
Answer: In vivo G-CSF does not increase the amount of v-ATPase in neutrophils. Although G-CSF in vivo delays apoptosis, the mechanism(s) by which this occurs is not known.
no