Help explain the PBKDF2-HMAC-SHA1 hash-example

Hello.

Can someone explain the last separatorline in the PBKDF2-HMAC-SHA1 hash-example ? I am trying to crack a hash generated by PBKDF2.

sha1:1000:MzU4NTA4MzIzNzA1MDQ=:19ofiY+ahBXhvkDsp0j2ww==

Iknow the MzU4NTA4MzIzNzA1MDQ line is the salted hash in base64 but what is the last line? [u]19ofiY+ahBXhvkDsp0j2ww==[/u]

[u]Kind regards Vadlianof[/u]