There is a report of the EGFR tyrosine kinase domain being expressed in E. coli as a GST fusion (see the link). That group used BL21 codon plus RIL. They also show that elimination of a 13 a.a. segment of the protein increased its expression, so you may want to compare the sequence you are expressing to theirs.
XRP token and Ripple Payment Protocol are Different. Ripple is a global settlement network which allows banks to transfer money and settle international payments in different currencies. As more banks use Ripple protocol, it is becoming more valuable. Contrary to popular belief, XRP currency is different than the Ripple protocol. XRP is a token or a native currency that works under Ripple Transaction Protocol. XRP protects the Ripple network from DDOS attacks, and prevents spam.
0. You can continue to add additional flip-flops, always inverting the output to its own input, and using the output from the previous flip-flop as the clock signal. The result is called a ripple counter, which can count to 2 - 1 where n is the number of bits (flip-flop stages) in the counter. ring counter is a Shift Register (a cascade connection of flip-flops) with the output of the last one connected to the input of the first, that is, in a ring. Typically, a pattern consisting of a single bit is circulated so the state repeats every n clock cycles if n flip-flops are used.