From what I remember from Uni days I'm pretty sure first passage is when your original cells divide so many times that you have to transfer some of them to a new plate to continue cell culture. So say we have 20 DP cells on a plate. After a fews days and the right conditions we have 60 DP cells and the plate is full. You then have to grab most of these cells and transfer them to a new plate and restart the division process. The cells that just got transferred to a new plate are known as Passage 1. And every time you do this again, it is called passage 2, 3 and so on...
As you go down the passages (e.g. 3, 4, 5) you start losing more and more properties of the original cell lines, kind of like photocopying the photocopy over and over...
So usually the best passages are the second and third. Now what I was referring to was that they seem to be able to culture sufficient cells in the first few passages (passage 2, 3, 4) to cover the entire balding area, which is magnificent
As you go down the passages (e.g. 3, 4, 5) you start losing more and more properties of the original cell lines, kind of like photocopying the photocopy over and over...
So usually the best passages are the second and third. Now what I was referring to was that they seem to be able to culture sufficient cells in the first few passages (passage 2, 3, 4) to cover the entire balding area, which is magnificent

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