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  • Infection Engines

    Infection Engines

    Image of the Week

    A group of intracellular tachyzoites of the toxoplasmosis-causing parasite Toxoplasma gondii.

  • Spooky Sedge

    Spooky Sedge

    Image of the Week

    Oh the horror! A cross-section of the stem of yellow nut sedge plant (Cyperus esculentus)

  • A Model Microbe

    A Model Microbe

    Image of the Week

    Tetrahymena thermophila is a freshwater unicellular ciliated protozoan related to Paramecium.

  • Fellowship of the Rings

    Fellowship of the Rings

    Image of the Week

    The nuclear pore is a complex of three rings of proteins that controls the passage of materials in and out of the nucleus.

  • A Predator in the Plankton

    A Predator in the Plankton

    Image of the Week

    The comb jelly (Beroe cucumis) uses its large mouth and cilia-powered motor to prey upon members of the plankton family, including other ctenophores.

  • What Makes Flowers Red?

    What Makes Flowers Red?

    Image of the Week

    The petals of flowers get their vibrant colors from cells packed with pigments such as orange carotenoids and pink anthocyanins.

  • Solar Fix

    Solar Fix

    Image of the Week

    The cells of the liverwort (Marchantia polymorpha) are packed with chloroplasts.

  • Let's Stick Together

    Let's Stick Together

    Image of the Week

    Sponges feed themselves through chambers of specialized cells.

  • Dengue Virus Enters a Cell

    Dengue Virus Enters a Cell


    (1 min 33 sec) Infection begins when the dengue virus uses receptors on an immune cell's surface to gain entry and release its genome.

  • HIV life cycle

    HIV life cycle


    (4 min 52 sec) How HIV infects a cell and replicates itself using reverse transcriptase and the host's cellular machinery.

  • Amoeboid Sperm of C. elegans

    Amoeboid Sperm of C. elegans


    (11 sec) Video closeup of the C. elegans sperm that moves like an amoeba.