NHLBI requires a vibrating microtome with a step size no greater than .001mm and less than 1 micron deflection.
Quotes for Leica VT1200 S, Leica VT1200 & Leica VT1000 S or comparable microtomes will be acceptable as meeting the requirement.
All responsible sources may submit a response which, if timely received, must be considered by the agency.