ISCA2 GI:160420328 iron-sulfur cluster assembly 2 1 maaawgsslt aatqravtpw prgrlltasl gpqarreass sspeagegqi 50 51 rltdscvqrl leitegsefl rlqvegggcs gfqykfsldt vinpddrvfe 100 101 qggarvvvds dslafvkgaq vdfsqelirs sfqvlnnpqa qqgcscgssf 150 151 sikl