vtranscr ktransl nribo PGKCmRNA mu PGKBp mu PGKCp kdegrpB PGKBp kdegrpC PGKCp ksplic precur kdegrp precur mu precur mu PGKBmRNA kdegrB PGKBmRNA mu PGKCmRNA kdegrC PGKCmRNA ktransl nribo PGKBmRNA