sentence: While both coiled-coil rich proteins ( Ccrp ) and the bactofilin homolog CcmA have been implicated in H. pylori cell shape ( Specht et al ., 2011 ; Sycuro et al ., 2010 ; Waidner et al ., 2009 ) , only loss of CcmA , and not individual Ccrps , results in a drastic cell shape defect in our strain background ( Yang et al ., 2019 ) ; Δ ccmA cells are nearly straight .