Differences between DH5a strain of E. Coli and BL21 strain of E.Coli - (Apr/01/2015 )

Can anybody inform me about differences between DH5a strain of E. Coli and BL21 strain of E.Coli

Burak Kaan Yasdı on Wed Apr 1 14:37:59 2015 said:

Can anybody inform me about differences between DH5a strain of E. Coli and BL21 strain of E.Coli

https://bio.as.uky.edu/sites/default/files/E_coli_host_strains_genotypes.pdf

http://openwetware.org/wiki/E._coli_genotypes

Both links can be usefull..

Its hard to tell you what the differences are that matter for you...

In short: DH5a is a general strain for cloning and blue white screening
BL21 is more for protein expression, it lacks certain proteases.

Thanksss. This is a homework from my molecular biology laboratory class.