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The Tanner scale (also known as the Tanner stages or sexual maturity rating (SMR)) is a scale of physical development as pre-pubescent children transition into adolescence, and then adulthood. The scale defines physical measurements of development based on external primary and secondary sex characteristics , such as the size of the breasts ...
The anagen phase, known as the growth phase, is when the hair grows about 1 cm per month. [11] It begins in the papilla and can last from three to five years. [12] The span at which the hair remains in this stage of growth is determined by genetics. The longer the hair stays in the anagen phase, the longer it will grow.
Microscopy of keratin filaments inside cells. Keratin (/ ˈ k ɛr ə t ɪ n / [1] [2]) is one of a family of structural fibrous proteins also known as scleroproteins.It is the key structural material making up scales, hair, nails, feathers, horns, claws, hooves, and the outer layer of skin in vertebrates.
The growth rate of hair varies from individual to individual depending on their age, genetic predisposition and a number of environmental factors. [14] It is commonly stated that hair grows about 1 cm per month on average; however reality is more complex, since not all hair grows at once.
The keratinocyte growth factor (KGF), also known as FGF7, is a growth factor present in the epithelialization-phase of wound healing. In this phase, keratinocytes are covering the wound, forming the epithelium. KGF is a small signaling molecule that binds to fibroblast growth factor receptor 2b (FGFR2b). [1]
Growth charts have been constructed by observing the growth of large numbers of healthy children over time. The height, weight, and head circumference of a child can be compared to the expected parameters of children of the same age and sex to determine whether the child is growing appropriately. Growth charts can also be used to predict the ...
Alpha-keratin, or α-keratin, is a type of keratin found in mammalian vertebrates. This protein is the primary component in hairs , horns , claws , nails and the epidermis layer of the skin . α-keratin is a fibrous structural protein , meaning it is made up of amino acids that form a repeating secondary structure.
The outer surface of the beak consists of a thin sheath of keratin called the rhamphotheca, [2] [5] (p148) which can be subdivided into the rhinotheca of the upper mandible and the gnathotheca of the lower mandible. [10] (p47) The covering arises from the Malpighian layer of the bird's epidermis, [10] (p47) growing from plates at the base of ...