More than a year ago, the world was shocked by Chinese biophysicist He Jiankui’s attempt to use CRISPR technology to modify human embryos and make them resistant to HIV, which led to the birth of twins Lulu and Nana. Now, crucial details have been revealed in a recent release of excerpts from the study, which have triggered a series of concerns about how Lulu and Nana’s genome was modified. How CRISPR works CRISPR is a technique that allows scientists to make precise edits to any DNA by altering its sequence. When using CRISPR, you may be trying to “knock out”…

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