3.2.2.8 cotyledon - 4168 3.2.2.8 guard cell - 700741 3.2.2.8 pollen - 700741 3.2.2.8 promastigote - 137115, 137116 3.2.2.8 root - 700741 3.2.2.8 root tip - 700741 3.2.2.8 root vascular cell URH1 is mainly transcribed in the vascular cells of roots 700741 3.2.2.8 vascular cell of roots and in root tips 700741