how bad is it if i didn't know very specific details about my research in an interview

for context i use a mouse model (made by a diff lab) and i blanked and couldnt describe in detail the specific gene expression mechanism/system that it uses. i looked it up afterwards and it's not that complicated and definitely something i have learned before...

obviously i should have known that but considering that the model is not the focus of my research, how bad is this exactly.😭 i explained the rest of my research fine

also i hope this makes someone else feel better lmao