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  2. Checkpoint - Wikipedia

    en.wikipedia.org/wiki/Checkpoint

    Border checkpoint, a place on the land border between two states where travellers and/or goods are inspected; Security checkpoint, erected and enforced within contiguous areas under military or paramilitary control

  3. Cell cycle checkpoint - Wikipedia

    en.wikipedia.org/wiki/Cell_cycle_checkpoint

    The G 2-M checkpoint occurs between the G 2 and M phases. The spindle checkpoint occurs during the M phase. Key cyclins associated with each phase are shown. Cell cycle checkpoints are control mechanisms in the eukaryotic cell cycle which ensure its proper progression.

  4. Border checkpoint - Wikipedia

    en.wikipedia.org/wiki/Border_checkpoint

    Italian-Swiss border post – since Switzerland joined the Schengen Area in 2008, this checkpoint is solely for customs formalities. The Schengen Borders Code, which forms part of the law of the European Union, defines some terms as follows (particularities with respect to the EU are left out, in order to emphasize general usability of those definitions): [3]

  5. G2-M DNA damage checkpoint - Wikipedia

    en.wikipedia.org/wiki/G2-M_DNA_damage_checkpoint

    Cells with a defective G 2-M checkpoint will undergo apoptosis or death after cell division if they enter the M phase before repairing their DNA. [1] The defining biochemical feature of this checkpoint is the activation of M-phase cyclin-CDK complexes, which phosphorylate proteins that promote spindle assembly and bring the cell to metaphase. [2]

  6. Schengen Area - Wikipedia

    en.wikipedia.org/wiki/Schengen_Area

    The border checkpoint in La Farga de Moles on the Andorra–Spain border Four European microstates — Andorra , [ 4 ] Monaco , San Marino and the Vatican City — are not officially part of the Schengen Area, but are considered de facto within the Schengen Area, as they have open or semi-open borders and do not conduct systematic border ...

  7. AP Spanish Literature and Culture - Wikipedia

    en.wikipedia.org/wiki/AP_Spanish_Literature_and...

    The exam is divided into two sections with several parts. Section I, consisting of 65 multiple-choice questions, is split into two parts. Part A (15 questions) is the listening component, which includes a twice-recited poem, a recording of an interview with an author, and a presentation concerning a topic that relates to the course.

  8. AP Spanish Language and Culture - Wikipedia

    en.wikipedia.org/wiki/AP_Spanish_Language_and...

    This course is primarily a comprehensive review of all previous knowledge pertaining to the Spanish language. This class builds upon the skills developed within introductory and intermediate Spanish classes by applying each skill to a specific, contemporary context; common themes include health, education, careers, literature, history, family, relationships, and the environment.

  9. Thymocyte - Wikipedia

    en.wikipedia.org/wiki/Thymocyte

    Thymocytes are classified into a number of distinct maturational stages based on the expression of cell surface markers. The earliest thymocyte stage is the double negative stage (negative for both CD4 and CD8), which more recently has been better described as Lineage-negative, and which can be divided into four substages.