Cells

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stem cell

THREE-PARENT PITFALL  A therapy to replace defective batteries, called mitochondria, in cells could fail if some of the undesirables multiply and displace healthy mitochondria. 

Monocercomonoides

SMALLEST LOSER  This gut microbe, known for decades, may change the way textbooks describe complex cells: It appears to be missing mitochondria.

sperm

BOUND  Mouse sperm (left, red) flock to a polymer bead coated with the sperm-binding sections of a protein found around unfertilized eggs (illustration, right). Such beads could someday be used as contraceptives or a method for identifying healthy sperm, researchers report. 

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