An anti-up quark is an antiquark which corresponds to the up quark.

The up quark, the down quark, and the electron. Two up quarks and a down quark form a proton, and two down quarks and an up quark form a neutron.

-Down and anti-Down quark,

-Up and anti-Up quark or

-Strange and anti-Strange quark

then the quark is created into a conductor

The antiparticle of a quark is called as an anti quark.

Which has the same mass but other properties are opposite.

Example - Their charge.

From the family(group) of quark

Up has +2/3 whereas anti-up has -2/3.

Quark is a matter ( particle ) whereas an anti quark ( antiparticle ) is antimatter