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This activity explores images of planarians regenerating missing body parts, which serve as phenomena for learning about cell division and differentiation.

This short video explores how a baby’s microbiome is established during birth.

This activity guides the analysis of a published scientific figure from a study on how social status affects the expression of genes involved in immune system processes.

This activity analyzes a published scientific figure from a study assessing if the microbiota from a mother affects the immune systems of the developing offspring.

This demonstration models the first step of the HIV life cycle: the binding of HIV envelope proteins to receptors on human helper T cells.

This activity explores an image of early embryonic cells, which serves as a phenomenon for learning about cell division and development.

This animation shows how varying concentrations of a signaling molecule activate different transcription factors to determine cell fate.

This video shows real footage of a cytotoxic T cell killing a cell infected by a pathogen.

This animation shows how a cell infected by a virus signals cytotoxic T cells to destroy itself.

This animation shows how stem cells from early mammalian embryos can be grown and studied in a laboratory.

This animation describes the formation and fates of the three germ layers in a human embryo.

This animation shows how salamanders can replace missing limb tissues with the help of cells similar to stem cells.