trying to disassemble laptop

[Ec0n0metriX]

i'm trying to open the case on an Asus z91e notebook, i've removed all the screws i can see but something is holding the case together in the middle. Anyone know what it is and how to remove it?

 

[ShadowBlade]

is there another screw beind a label?
if you run your fingers over it, you should be able to feel the hole if there is one