Parallel Universes

Cell biologists are a truly astonishing folk. They've invented - and live in - parallel universes (the universe of HeLa cells, the universe of PBMC's, the universe of Jurkat cells etc etc), each with different and non-overlapping Truths of their own (the Truth of XX et al. ; the Truth of YY and colleagues). They are masters of logic (the dominant-negative mutant that blocks anti-oestrogen resistance in tamoxifen-positive breast cancer cell lines), and are not afraid of putting parsimony in the bin if that allows saving their Favourite Theory by evoking a model of gothic complexity. Yes I can give you references, just ask.
Does this teach us something about biology? Well, I guess it teaches us something about the Human Mind, and keeps a whole lot of highly qualified persons off the streets.