SDK may refer to:
The Slovak Democratic and Christian Union – Democratic Party (Slovak: Slovenská demokratická a kresťanská únia – Demokratická strana, SDKÚ-DS) is a liberal-conservative and Christian democraticpolitical party in Slovakia. The SDKÚ-DS is a member of the European People's Party (EPP) and Centrist Democrat International.
SDKÚ-DS is a centre-right party, presenting it self as an alternative to the social-democratic ideology of the Direction – Social Democracy (Smer-SD) party. After the general elections, SDKÚ-DS reached an agreement with other centre-right parties and formed the government of Slovakia. The party has criticised the policies of Robert Fico's Smer-SD party, calling them irresponsible, unsustainable and populist. SDKÚ-DS is the fifth largest party in the National Council. Its policy includes continuing in reforms that took place before 2006, including tax reform, welfare benefits cuts, pensions reform, healthcare reform etc. SDKÚ-DS is currently organised into four sections:
Protein sidekick-2 is a protein that in humans is encoded by the SDK2 gene.
The protein encoded by this gene is a member of the immunoglobulin superfamily. The protein contains two immunoglobulin domains and thirteen fibronectin type III domains. Fibronectin type III domains are present in both extracellular and intracellular proteins and tandem repeats are known to contain binding sites for DNA, heparin and the cell surface. This protein, and a homologous mouse sequence, are very similar to the Drosophila sidekick gene product but the specific function of this superfamily member is not yet known. Evidence for alternative splicing at this gene locus has been observed but the full-length nature of additional variants has not yet been determined.