Creating human-sheep chimera embryos

1. Stem cells are made from adult human cells

2. These are introduced into

an early-stage sheep embryo

Cell

mass

3. Hybrid embryo is returned to sheep

carrying a small fraction

of human cells

The ultimate goal

To develop sheep with selected, fully transplantable, human organs

1. Stem cells are made from adult human cells

2. These are introduced into

an early-stage sheep embryo

Cell mass

3. Hybrid embryo is returned to sheep carrying a small fraction of human cells

The ultimate goal

To develop sheep

with selected, fully transplantable,

human organs