You will be given a definition of a task first, then some input of the task.
In this task, you are given two sentences in the English language (Sentence 1 and Sentence 2). Your task is to identify the connecting word between the two sentences.

Sentence 1:PrP has been detected in the blood of sick animals by means of PMCA technology . Sentence 2:However , repeated cycling over several days , which is necessary for PMCA of blood material , has been reported to result in decreased specificity ( false positives ) .
Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
however