"A key with "Dissection Room" written on the keychain tag."
Dissection Room Key (解体室のカギ kaitai-shitsu no kagi ) is a key item in Resident Evil 7: Biohazard.
The Dissection Room Key opens up the Dissection Room in the Processing Area.
The Dissection Room Key is located in the Incinerator Room in the Processing Area. It is in Travis' spot (alone with a Molded) which can only be opened by first opening the one with the bloody handprint and Tamara's as explained by the Incinerator Room Memo.