Question: Which are the subunits of the IkB protein kinase (IKK)?

Context:
NEMO (NF-κB essential modulator) associates with catalytic subunits IKKα and IKKβ to form the IκB kinase (IKK) complex and is a key regulator of NF-κB pathway signaling.
All known NF-κB activators converge on the IkappaB kinase (IKK) complex to activate the canonical and non-canonical NF-κB pathways. The IKK complex contains two catalytic subunits (IKKα and IKKβ) and a regulatory subunit NEMO/IKKγ that regulates the canonical NF-κB pathway, whereas IKKα regulates the non-canonical pathway.
 The IKK protein complex is comprised of IKKα, IKKβ and NEMO subunits, with IKKβ thought to play the dominant role in modulating NF-κB activity. 
The IκB kinase (IKK) complex plays a crucial role in the activation of the transcription factor NF-κB by phosphorylating an inhibitory molecule IκBα. Recently, we showed that IKK2 (also called IKKβ), a catalytic subunit of the IKK complex, induces immunoglobulin E-mediated degranulation in mast cells by phosphorylating SNAP-23, the target-membrane soluble N-ethylmaleimide-sensitive fusion factor attachment protein receptor (SNARE).
The depletion of any of the three subunits of the inhibitor of NFκB (IκB) kinase (IKKα, IKKβ, IKKγ/NEMO), each of which is essential for the canonical NFκB activation pathway, limits autophagy induction by physiological or pharmacological triggers, while constitutive active IKK subunits suffice to stimulate autophagy. 
NF-κB activation is tightly regulated by the IκB kinase (IKK) complex, which is composed of two catalytic subunits IKKα and IKKβ, and a regulatory subunit IKKγ/NEMO.
Activation of the classical NF-κB pathway is mediated through the activity of the IKK kinase complex, which consists of a heterotrimer of IKKα, IKKβ, and IKKγ subunits. 
NF-kB is a key regulator of inflammation and immunity in cancer development. The IkB kinase (IKK) is a multisubunit complex containing catalytic subunits termed IKK-α, -β and -γ. 
Activation of NF-κB involves the IκB kinase (IKK)-complex composed of two catalytic subunits, IKKα and IKKβ, and a regulatory scaffold protein, IKKγ.
The IKK kinase complex is the core element of the NF-kappaB cascade. It is essentially made of two kinases (IKKalpha and IKKbeta) and a regulatory subunit, NEMO/IKKgamma.
Additional components may exist, transiently or permanently, but their characterization is still unsure.
Activation of NF-kappaB subunits is regulated by the upstream IkappaB kinase (IKK) complex which contains IKKalpha, IKKbeta, and IKKgamma; the latter also known as NF-kappaB essential modulator (NEMO).
Proinflammatory NF-kappaB activation requires the IkappaB (inhibitor of NF-kappaB) kinase (IKK) complex that contains two catalytic subunits named IKKalpha and IKKbeta and a regulatory subunit named NF-kappaB essential modulator (NEMO).
Inhibition of NF-kappaB by suppressing the canonical NF-kappaB activation pathway, for instance by knockdown of the three subunits of the inhibitor of NF-kappaB (I kappaB) kinase (IKK) complex (IKK1, IKK2 and NEMO) triggers apoptosis in such cells. 
The IkappaB-Kinase (IKK) complex is a multisubunit protein complex crucial for signal-induced phosphorylation of the IkappaB proteins and thus controls the activity of the transcription factor NF-kappaB. Besides the two kinases IKKalpha and IKKbeta, the IKK complex contains NEMO/IKKgamma, an additional subunit with regulatory and adaptor functions.
Activation of a large multisubunit protein kinase, called the inhibitor kappaB kinase (IKK) complex, is central to the induction of the family of transcription factors nuclear factor kappaB. IKK is comprised of two catalytic subunits, IKKalpha and IKKbeta, and a regulatory IKKgamma subunit.
The IkB kinase (IKK) is a multisubunit complex containing catalytic subunits termed IKK-α, -β and -γ

Answer: Proinflammatory NF-kappaB activation requires the IkappaB (inhibitor of NF-kappaB) kinase (IKK) complex that contains two catalytic subunits named IKKalpha and IKKbeta and a regulatory subunit named NF-kappaB essential modulator (NEMO).Additional components may exist, transiently or permanently, but their characterization is still unsure.
The IKK kinase complex is the core element of the NF-kappaB cascade. It is essentially made of two kinases (IKKalpha and IKKbeta) and a regulatory subunit, NEMO (NF-kB Essential Modulator)/IKKgamma. Additional components may exist, transiently or permanently, but their characterization is still unsure.
 The IKK protein complex is comprised of IKKα, IKKβ and NEMO subunits, with IKKβ thought to play the dominant role in modulating NF-κB activity.   The IkappaB-Kinase (IKK) complex is a multisubunit protein complex crucial for signal-induced phosphorylation of the IkappaB proteins and thus controls the activity of the transcription factor NF-kappaB. Besides the two kinases IKKalpha and IKKbeta, the IKK complex contains NEMO/IKKgamma, an additional subunit with regulatory and adaptor functions.  
Exact answer: IKKalpha, IKKα, IKK1, IKKbeta, IKKβ, IKK2, IKKgamma, IKKγ, NEMO