Generate a more complex version of this sentence The precursor phloem was suggested to be the main area of accumulation.
Mesthi wae, versi sing luwih rumit saka ukara kasebut yaiku "Phloma prekursor disaranake dadi area akumulasi utama nanging kafein uga ditemtokake ana ing prekursor xylem, kanthi konsentrasi sing luwih murah. "