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GlossaryCluster of Differentiation (CD)

system for identifying cell surface molecules, especially on white blood cells

Cluster of Differentiation (CD) refers to a system used to identify and classify surface molecules on cells, particularly white blood cells, which are critical for the immune system. These molecules serve as markers that help differentiate between various cell types and their functions, and are often used in medical diagnostics and research to understand immune responses and diseases.

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Bald Scalp in Men with Androgenetic Alopecia Retains Hair Follicle Stem Cells but Lacks CD200-Rich and CD34-Positive Hair Follicle Progenitor Cells

research Bald Scalp in Men with Androgenetic Alopecia Retains Hair Follicle Stem Cells but Lacks CD200-Rich and CD34-Positive Hair Follicle Progenitor Cells

235 citations, January 2011 in “Journal of Clinical Investigation”

Men with baldness due to androgenetic alopecia still have hair stem cells, but lack specific cells needed for hair growth.

research The Transcriptional Repressor CDP (Cutl1) Is Essential for Epithelial Cell Differentiation of the Lung and the Hair Follicle

165 citations, September 2001 in “Genes & development”

CDP is crucial for lung and hair follicle cell development.

research Skin CD4+ Memory T Cells Exhibit Combined Cluster-Mediated Retention and Equilibration with the Circulation

155 citations, May 2016 in “Nature communications”

Memory T cells in the skin balance staying put and moving into the blood, clustering around hair follicles, and increasing in number after infection.

research Prevention of Chemotherapy-Induced Alopecia in Rats by CDK Inhibitors

153 citations, January 2001 in “Science”

Using CDK inhibitors on rats showed a reduction in chemotherapy-caused hair loss, but later experiments could not repeat these results.

research Hyaluronate Fragments Reverse Skin Atrophy by a CD44-Dependent Mechanism

135 citations, December 2006 in “PLoS Medicine”

Hyaluronate fragments can help reverse skin thinning by working with the CD44 receptor.

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community Can anyone tell me if this might be dangerous or good for my hair/head/body ?

in Question 7 years ago

A user is asking if a new hair product, Cypress Premium Vials Energy and Cypress Premium Shampoo Energy, could be dangerous or worsen their hair condition. The product contains various ingredients including water, alcohol, menthyl lactate, and several extracts.

community Shedding or receding even more?

in Journals / Progress Pictures 159 upvotes 2 days ago

The user experienced hair shedding after using finasteride and topical minoxidil since August 2024, and briefly adding oral minoxidil in early 2025. They suspect the shedding might be due to the oral minoxidil, a bad batch of finasteride, or a normal shedding cycle, and are also experiencing an itchy scalp and acne.

community On Finasteride for 9 months and minoxidil for 5 months

in Journals / Progress Pictures 44 upvotes 1 week ago

The user has been using finasteride for 10 months and minoxidil for 5 months to treat hair loss. They are seeking feedback on their progress and wondering if a hair transplant is necessary.

community 1 year on fin, before and after

in General 31 upvotes 1 week ago

The user has been using finasteride three times a week for a year and plans to add minoxidil to improve hair regrowth. They are seeking opinions on any noticeable new hair growth.

community How iam doing iam receding male 28

in General 44 upvotes 2 weeks ago

A 28-year-old male is experiencing hairline recession despite his family having full heads of hair. Suggested treatments include finasteride, minoxidil, and ketoconazole 2% shampoo.

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