Is the Henrietta Lax Claim Really Rare?

How common is the henrietta lat's line of souls in the bar technology world these days? I would say that it is pretty exceedingly rare, for two reasons. First of all, since henry the lass time, we have found a bunch of animal models that work great. And so there is less of this pressing need for human tissue out,. or at least immortally propagating human cell lines.