title: Defects in pollen-tube differentiation prevent fertilization.
authors.affiliation: Department of Molecular Biology, Celllular Biology & Biochemistry Brown University Providence, RI 02912.
authors.forename: Alexander R
authors.initials: AR
authors.lastname: Leydon
authors.affiliation: Department of Molecular Biology, Celllular Biology & Biochemistry Brown University Providence, RI 02912.
authors.forename: Mark A
authors.initials: MA
authors.lastname: Johnson