The National Institutes of Health will be providing grants that encourage the use of new types of tissue that would replace fetal tissue in medical research.

“The program aims to develop and/or further refine human tissue models that closely mimic and can be used to reliably model human embryonic development or other aspects of human biology, for example, the human immune system,” the NIH said in a statement. “Research proposals may include using these models to understand human tissue development, function, and disease.”