[USMA:14342] weird units

[Carter, Baron]

cM centimorgan   The centiMorgan is a unit equal to one percent (1 %)
recombination

kDa kilodalton
 
seen here   http://link.springer.de/link/service/journals/00335/author.html
<http://link.springer.de/link/service/journals/00335/author.html> 

 
centiRays
 
seen here
http://www.jax.org/resources/documents/cmdata/rhmap/maps/11MapPage.html
<http://www.jax.org/resources/documents/cmdata/rhmap/maps/11MapPage.html> 
 
What are these and will they go away?
 
 
Baron Carter