The great thing about transphobes such as yourself is your are UNABLE to correctly gender the trans person you are currently in a huff over. You just can't do it! Because dangit they can't be HER catboys! Shes a man! It makes your motives very easy to identify. Thank you.
For anyone interested in what these labs look like, the podcast "TWiV" (This Week in Virology) did a video where they visit Boston's BSL-4.
Software engineers might appreciate the simplicity with which redundant failsafes are attained - each Biosafety Level being contained by a less safe abstraction.
Thus a BSL-4 lab is essentially 4 labs built inside themselves, like a Matryoshka doll for pathogens.