Nuclea Biotechnologies, a developer and maker of diagnostic tests for cancer and diabetes, has received a $510,000 state tax incentive to develop more manufacturing in Pittsfield and create 25 jobs. “We’re exited about that it really gives us a boost,” said Patrick J. Muraca, president and chief executive officer and co-founder of Nuclea. The jobs, he said, will involve making a new technology related to his company's diagnostic tests. The jobs will begin at $50,000 or more a year. Muraca credited state Sen. Benjamin Downing, D-Springfield, for his help with the incentive.