These specialised vascular cells form hollow tubes kept rigid and open by thickened ribs of secondary cell wall that provide the major structural element in wood.
The nuclear lamina (NL), a dense fibrillar network covering the inside of the nuclear membrane in metazoan cells [reviewed in 1], is thought to represent a major structural element for the nuclear organization of the genome.
Eukaryotic genomes are packaged into chromatin, the major structural element of which is nucleosome.
11 13 14 Functionally, the best understood tetraspan proteins are connexins, which form the major structural element of gap junctions.
The fetal membranes consist of the fetal amnion and chorion and the attached maternal decidua, which together comprise a major structural element of the uterine tissues and have endocrine functions in pregnancy and parturition not yet fully elucidated [ 43].
As fibrillar type I collagen is by far the major structural element of the ovarian stroma, this modality may be well-suited for probing morphological and structural changes associated with early ovarian cancer.
