Advances in single-cell technologies have revealed vast differences between cells once thought to be in the same category, calling into question how we define cell type in the first place.

No two neurons are alike. What does that mean for brain function?

Recent advances in single-cell omics and other techniques are revealing variation at genomic, epigenomic, transcriptomic, and posttranscriptomic levels.

Somatic mosaicism may be responsible for a larger proportion of genomic variability within humans than previously thought.

Meet some of the people featured in the April 2015 issue of The Scientist.