Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number DF143 found under Alanine Aminotransferase Test Re by Siemens Healthcare Diagnostics Inc. The National Stock Number assigned to this part is 6550016555985, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like DF143.