A company that manufactures liver cells is planning to move part of its operation from Maryland to Malden Center. In Vitro ADMET Laboratories is planning to move into four condo suites at 389 Main St. , where it will manufacture liver cell products and conduct training, according to plans submitted to the city. It will be a relatively small operation, with three or four on-site employees. But scientists from Boston and Cambridge will regularly make trips to the lab to conduct training, and city officials said they hope the facility is the first step in luring biotech companies to Malden. “We feel like it’s going to put us on their map, and when they look to relocate, hopefully Malden will be in the mix,” said Kevin Duffy, Malden’s business development officer. The lab requires a special permit from the city’s Planning Board, which will be considered in a meeting Wednesday at 7 p.m. at Malden Government Center.