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    Howard Hughes Medical Institute
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    In this activity, learners use microarray technology to determine which genes are turned on and off at various points in the differentiation of pluripotent stem cells on their way to becoming...

    1 cent - $1 per group Ages 14 - adult 1 to 2 hours
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    Howard Hughes Medical Institute
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    This mirror-tracing activity related to proprioception is a visual and motor test that involves learning a new motor skill. The task requires learners to move a pencil to trace the diagram of a...

    1 cent - $1 per student Ages 11 - 18 1 to 7 days