build of PGP Key

[gabriel zampeze]

Someone can explain me the build of PGP key like this one :

-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1.2.4 (MingW32)
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=RKnd
-----END PGP PUBLIC KEY BLOCK-----

cos this key contains more information than only the public key, like expiration date,  version,  type of algorithm...

How i can take into  the public key ? after how i can transform it on real key (hexa cos a real key can contain no printable word) ?  

thx 

gabriel